On 2 separate occasions, approximately 3 months apart while in hard acceleration attempting to merge on an interstate on-ramp, vehicle began to shudder violently and lose power. In first instance, I was able to merge in the left lane and let off the accelerator. As vehicle coasted, the shudder subsided and within 1 minute stopped all together. In the second instance, when the vehicle lost power, traffic conditions would not allow me to merge and I was forced to coast along the shoulder of the road until the shudder subsided and power was resumed. In neither situation, did the vehicle go into safe mode or the check engine light appear. Vehicle simply resumed normal operation.

- Mt Zion, IL, USA

I was driving to the eastern shore in the rain. When I slowed down to get something to eat when I tried to get back on the road the truck shuddered and lost all power. It did it two more times that night and then it did it again leaving the toll booth on the chesapeake bay bridge tunnel two days later. I took it to the dealer and they tried to fix it but last week when it rain I drove to langley afb and it did it again. Contacted the dealer and they said to be patient and Ford will get back to me when they come up with a fix. How can I trust this truck when it rains. This is a dangerous thing and they will not fix it unless you make them. I almost got ran into on the bridge with all the vehicle merging back into traffic.

- Chesapeake , VA, USA

My 2012 Ford F150 with eco-boost engine stalls and shakes upon fast acceleration. This happens mostly on rainy damp days but has happened during night driving also. Once this happens the trucks looses all power and I have had to pull off the highway, turn the engine off and restart. Have brought the truck to the dealer on three occasions with no results of correction. I know this is a common problem with this engine and need help to get Ford to correct problem or allow trade for trade on a new truck without the eco-boost engine.

- Bourg, LA, USA

Dealer installed ECU update without my knowledge or authorization which changed how the vehicle accelerates, decelerates, shift points and engine stumbles continuously. Dealer does not have the ability to undo the update. Opened a case with Ford Motor Company, they basically blame the dealer for not informing the customer (myself) prior to installing the update and informed me they currently do not have a program to undo an update or install a previous update to return the vehicle back to factory specifications.

- Scottsdale, AZ, USA

Traveling with my wife from little rock to houston on a rainy / humid day with the temperature at about 80-85 degrees, I accelerated quickly to pass on a 4-lane highway. The truck began shuddering violently and we experienced a loss of power. After slowing down and pulling off and restarting the truck it seemed to run fine. This happened two more times during the trip. The second time the check engine light began to flash, but ended up going off. The third time the light flashed and stayed on. After getting back to houston I took the truck in and they "reprogrammed the cac" and installed a new "air dam deflector plate." I just got the vehicle back so I do not yet know if this fixed the problem permanently, however, I have searched numerous blogs and websites and discovered that hundreds of other owners have had the exact same experience with their 3.5L ecoboost engines. I also understand that Ford has not offered any kind of recall for this problem. The characteristics of the power loss (and exactly at a critical time when power is needed) were frightening and extremely dangerous. Had I been passing on a two-lane road instead of a 4-lane highway, we could have been killed. There is the potential for a head-on collision, a second car rear-ending my vehicle, or a loss of control due to the shuddering and instability at high speeds. I did contact Ford regarding this and was basically told there is no recall and they just recommended that I have the repairs done. It is completely ridiculous that they know about this issue and don't 1) recall the vehicles that may experience this problem and, 2) let the general public know about the issue - for those purchasing a new vehicle. It is deceptive and irresponsible.

- Katy, TX, USA

The contact owns a 2012 Ford F-150. The contact stated that while traveling approximately 55 mph, the vehicle suddenly lost acceleration power. The vehicle was taken to the dealer where the air cooler and several other unknown components were replaced but the failure recurred multiple times. The manufacturer was contacted about the failure. The failure mileage was 11,577.

- Buloxi, MS, USA

I put my truck into drive and it hesitates, jumps back and fourth being real sluggish. The only way out of this is to floor the gas and let it push through for about five to ten seconds and then it is done. Which is hard to do when it is time to take my kids to school and I am in a school zone. This is very intermittent, but happens more often than not. If I let the car remain off for more than 15 minutes then the cycle can continue. Sometimes it starts up and drives fine. I notice it is more and more prevalent as the miles climb up. It has been doing this since the beginning and is still doing this. Since around 20000 miles the truck hesitates on the road after driving for sometime. So now it happens whenever it wants to. I have read online that this is a common occurrence that Ford knows about, just doesn't admit to or try to fix. My best friend had to trade his truck in because of this problem. This has the potential to be a problem just like the acceleration of the Toyota. This problem happens sporadically but it is more often than not. Now the transmission is jumping when slowing down or speeding up. I was told this is normal, it is just the computer getting used to my driving. I don't make a habit of making my truck hesitate at all. So this is a dumb response that once again, many people online get the same answer. I am nearing my 36000 mark. So I know this is about to cost me out of my own pocket to fix because the Ford house will just say nothing is wrong and not fix it. So my question is are transmissions really this cheap and we just move on and accept that craftsmanship in America or do we make Ford fix their issue. I have purchased many vehicles throughout my 39 years in this great country. I have never had a car act like this on such a wide scale with nothing being done about it. Please hold them accountable.

- Mansfield, TX, USA

Attempting to pass a vehicle on the highway, motor lost all power and began shaking. Code came up as engine misfire. Brought to the dealership said known issue, they inspected did not find anything wrong. Since that date has occurred 4-5 more times during wet weather anytime accelerating (passing vehicles, on ramps).

- Marlborough, MA, USA

I have had this problem several times. It seemed to start in October 2012. I was trying to merge into traffic and pushed the gas pedal down quickly and it did not move forward any faster. I I was almost rear-ended by another vehicle because I could not get any speed. It seems that when I push down the pedal very slowly, it will go faster. But when I need the response to be very quickly, it does not respond. I have had this problem when I pull my camper. It will be performing then all of a sudden, I will need to push down the pedal to get power up a hill and again, there is no power. I have taken this to the dealership and they keep saying that there is no problem. I bought this vehicle to pull my camper. It does not perform the way it was touted in their advertisements.

- Peyton, CO, USA

While driving on the interstate at about 60 mph. I pressed the accelerator to about 80% of travel. The transmission downshifted and the engine immediately had an almost total loss of power. I totally released the accelerator and then apply about 10% and the engine resumed normal operation. The engine continued on as normal - given traffic conditions I did not attempt a second hard accelerator application. It was raining and had been raining about an hour when this occurred. I call Ford and was given a tsb repair code. It is Ford tsb 13-8-1 - an earlier version of the this tsb was 12-10-19 and 12-6-4. this is a serious issue with this engine and could have caused a serious accident. The next day I did accelerate in the same fashion and the engine responded properly - it was not raining when I did this.

- Murphy, NC, USA

Accelerator would not respond while entering an intersection. The vehicle went into "limp home mode" and the display indicated the vehicle should be repaired immediately.

- Grant, FL, USA

Ford F150 2012 ecoboost ext cab 4X4 XLT after driving for several hours and stopping at a rest area I began to reenter the interstate. As I accelerated on the onramp traffic was moderate so I pressed on the accelerator even harder. The truck was in 5th gear and downshifted to 4th. The truck began to shutter and loose power. At this point I panicked and pushed the accelerator even harder. The truck downshifted into 3rd gear at which point it lost all power. All that I could do was let out at this point and hope to regain power. Fortunately traffic had moved over by the time I had made it to the end of the onramp at which point the truck had a clear and definitive miss and very little power. The truck slowly accelerated up to 60 mph and continued to miss for another quarter mile. After arriving at my parents home 5 hours later without another incident of full loss of power I dropped my wife off to get her car. As I pulled out the driveway only minutes later I punched the accelerator to see if the truck would do it again. The truck fell on its face. I could have got out and ran faster. Once again is missed for a quarter mile and cleared up. Today, I had to make a quick trip into town to pick up something for my wife. Again I punched the accelerator and the truck fell on its face and had no power. This time the check engine light came on and has stayed on ever since. Thankfully I have not been involved in an accident as of yet. These trucks need to be recalled before someone is killed!!!

- Louisville, KY, USA

Truck started to shake and lose acceleration while merging onto interstate traffic. Speed of approximately 60mph. Same issue occurred about 3 hours later while accelerating at highway speed, causing the vehicle behind me to make an aggressive move as not to rear end my truck. Approximately 65mph.

- Arlington, TX, USA

When accelerating and decelerating then accelerating the turbo drops out a severe loss of power occurred.

- Washington, DC, USA

On numerous occasions while accelerating to merge into traffic or to pass a slower vehicle or hard accelerating from a standing stop vehicle shakes and stalls, stays in second gear and has no throttle response, in wet or dry conditions, sometimes completely dying. On one occasion vehicle stalled and died while entering expressway causing me to have to run off road, hitting a sign and dirt bank to avoid approaching semi truck. Engine oil is diluted with gas, has burning smell in engine compartment. We are afraid of engine explosion and fire, burning smell is so bad. Ford has attempted several fixes, but problem continues, now there is a grinding grunt when going into reverse.

- Signal Mtn, TN, USA

I've had problems since the first month of purchase, first time it stalled pulling out of a stop sign with my kids in the truck, scared us to death. Second time, my wife and I were on the interstate going on vacation driving at night in a steady rain, truck begin to shudder and stalled out, had to pull over about 5 times during a 5 hour trip and sit until it would crank and run again. When I returned I took into Ford, they couldn't find any problems, truck kept doing the same in a rain so I took back to dealer and after the third or fourth time they said there is a defect and Ford has a new part coming out in October of 2012, ended up getting the part installed in December 2012. Truck is doing the same thing, just stalled on me in branson, Missouri, I called dealer and corporate Ford and get nowhere. I have a complaint file number with Ford corporate on this problem but no will help me or offer me a new truck without ecoboost. Very frustrating to buy a brand new $57K truck and find out it does not run well in the rain and Ford new of this problem when they sold it to me in April 2012. Now I find out there is a class action suit started in Louisiana and Ohio for the eco boost trucks. Dont really want to go this route but Ford and autonation-cook whitehead Ford dealer has given me no choice. We need to all publicly let our dealers know by being on the news or other means so Ford will stop selling these vehicles. Its not right to treat us this way.

- Panama City Beach, FL, USA

While driving on interstate I attempted to pass a slower vehicle. After moving over and accelerating - the truck buckled and stalled! I was almost rear ended by an 18 wheeler at 65 mph! this was very close to being a serious accident involving multiple vehicles. Please investigate and resolve this issue as Ford doesn't seem to be concerned about it. This vehicle has a 3.5L ecoboost engine with an automatic transmission and it also shudders at various speeds with a hard clunking sound during gear changes. Thank you.

- Valdese, NC, USA

This write up is for a 2012 Ford F-150 truck with the 3.5L ecoboost V-6 installed. Jan, 2013-while driving on I-24E, I was pulling out from the rest stop, just North West of exit 1. I went to pass a 18 wheeler and my truck came "unglued". it practically died in the passing lane when I pressed the gas peddle. It shuddered so hard; I didn't think I would be able to get off of the road before it died. It was missing and shuddering like crazy. I pulled off exit 1, shut the truck down and restarted. It ran ok without that same thing happening on the way home. I had a pretty descent "miss" in 6th gear, running down the interstate at 75mph. Something very strange happened here. It was the first issue I've had with my truck. Although I've noticed recently the mpg is down by 2.0 mpg or more for the last three weeks, and this from refueling at different locations, and the same driving style. Ford applied the tsb to reprogram the PCM/tcm to latest level, installed a deflector shield on the intercooler and possibly replace the drivers side catalytic converter if needed. July, 2013- this weekend while driving on I-65N, I had the same issue happen. The truck now has 17,000 miles on it. I've had the vehicle back into my local Ford dealer four times for this issue. The vehicle exhibits this issue when it's rainy and has been driven in the rain for several (50 or more) miles. In heavy traffic this is a very dangerous issue. The vehicle goes into some type of safe mode and will barely limp off the road. If this issue were to occur while crossing a four lane hwy, and sputtered one could be seriously injured or injure someone else.

- Clarksville, TN, USA

Having issues with the ecoboost accelerating upon take off or getting on to road ways numerous times I have come close to getting hit because of no power upon accelerating now this has been going since purchase new with only 116 miles and purchase date 3-17-2013. The dealer says this is normal operating condition for the vehicle to have lag time before power.my feeling is if you are sitting at a light and you give the vehicle gas the vehicle will move slow and then do a sudden acceleration and could cause death or injury to someone unsafe truck. Now I'm having issues with the driver window not going down or when it is down will not go up they say this is normal operating procedure Ford has some issue and they need to be corrected before someone gets killed or hurt bad.

- New River, AZ, USA

While accelerating to merge into traffic on the highway my truck lost acceleration at 60 mph. I let off the throttle and eased into it. The whole truck started shuttering and transmission was shifting extremely hard. It was all I could do to maintain speed. At the first stop light I shut the truck off in an attempt to reset the ECU. Once I took off it didn't happen again. It's just scary knowing that I could have caused an accident while trying to merge into traffic. This is not safe at all.

- Cocoa, FL, USA