While traveling at 55mph, up a slight incline on the highway, I pulled out to pass another vehicle. As I pressed on the accelerator I had no engine power and the F150, lariat, eco boost began to slow. The check engine light came on and flashed. I let off of the accelerator and then pressed it down again. This time I had power. I pulled back into the lane and everything appeared to be in working order.

- Gill, MA, USA

While trying to pass another vehicle during wet weather, my vehicle would loose engine power at a critical moment during passing. Ford dealer could find no problem. Loss of power happened more than one time while passing. After about one year of service I traded vehicle off....not liking the passing performance during wet weather. Then found out that this is a problem with many F150 ecoboost engines. I believe this is a serious issue.[xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Ackerly, TX, USA

While passing, my vehicle loses power and starts to sputter. This has happen on numerous occasions, and on the latest occasion the service engine light has come on. I have the 3.6 L ecoboost engine in the vehicle. I have turned the vehicle into the dealership for repairs, but was told they had to order a cooler to install on the turbo charger. Bottom line no parts are broke, but it now requires additional parts. I do not see any recalls for this issue.

- Raeford , NC, USA

Driving down the interstate during wet conditions my 2012 Ford F150 ecoboost started to stumble and loose power drastically while pulling a trailer. The truck would only do 30 mph as it shook and stumbled down the interstate. This power loss made it really dangerous to get off the road safely without other cars and trucks being affected. The only way to reset the truck was to shut the engine off and restart it. This has happened twice to me during wet rainy conditions. This issue really concerns me from the safety of my well being and other fellow drivers. Ford needs to take action in fixing this problem with the F150 ecoboost trucks.

- Mantorville, MN, USA

The contact owns a 2012 Ford F-150. The contact stated that while making a turn, the vehicle stalled and smoke emitted from under the hood. The vehicle was taken to the dealer where it was diagnosed that the motor failed. The vehicle was not repaired. The manufacturer was made aware of the failure. The VIN was not available. The failure mileage was 72,000.

- Leonard, MI, USA

The contact owns a 2012 Ford F-150. The contact stated that while driving approximately 45 mph, the vehicle would vibrate and there was a sudden loss of power. The contact also mentioned that the check engine warning light illuminated. The vehicle was able to restart. The failure occurred on several occasions. The vehicle was taken to the dealer who was unable to duplicate the failure. The manufacturer was not notified of the failure. The failure mileage was 20,000.

- Tucson, AZ, USA

At highway speeds a horrible shudder occurs. I took the truck in for service at 78000 miles, my warranty runs out at 80000. I was told that this was "normal for 157 inch wheelbase trucks" is there any help available for this? thank you, [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6)

- Brooklyn , WI, USA

This vehicle is equipped with the ecoboost 3.5L engine. While attempting to accelerate onto a highway, the vehicle sporadically and unpredictably loses power, seems to have trouble shifting gears and shudders severely. Because this has occurred on several occasions while entering a highway, it poses a definite safety risk of being struck in the rear of the vehicle. Complete loss of acceleration or stalling while entering a highway could result in a crash that could result in serious injury or death.

- Mendham, NJ, USA

While driving at highway speeds, after accelerating to pass another vehicle, the truck suddenly shuddered and there was significant power loss. So much so, it was dangerous to get over to the side of the road to see what was wrong. The vehicle continued acting like this throughout the day. I took it into a Ford dealership who 'resolved' the issue. 1.5 years layer, the same exact thing started occurring again (18jul2014). Again, it was unsafe for me to pull over after such a considerable power loss.

- Charlotte, NC, USA

Engine shutters, loss of power, engine misfires. Dealer has attempted to repair on several occasions. This problem has almost caused several accidents.

- Oklahoma City, OK, USA

Pulled into parking lot and truck stalled. Could not steer. Could not accelerate. Warning light popped up said low oil pressure. Was not on a hill. Ran vehicle health report through Ford sync service and everything came back ok. Will call dealership next. Had my daughter with me and it scared me to death.

- Bryant, AR, USA

Doing 45 on a two lane highway, pull out to pass, had no acceleration at all. I was unable to complete the passing. The first time this happened I thought perhaps I got bad gasoline. The second incident, a few months later, went just about exactly the same way. Recently, while attempting to merge on to a highway I put the pedal down, the vehicle seemed like it was missing very badly and it started shaking violently and would not stop for several minutes, even when I slowed down. I took the vehicle right to the dealership, it's still there.

- Commerce Twp, MI, USA

Was traveling up the roadway on 6/1/14 in our 2010 F-150 XLT and went to make a turn into an intersection. The vehicle stalled and was rendered useless in the middle of the intersection. The vehicle lost complete power, steering capability, and braking was diminished tremendously. We were stalled in an intersection with cross traffic approaching at 55mph. With little time due to oncoming vehicles, was able to immediately restart the engine and proceed, before oncoming vehicles approached us in the intersection. Not very safe being that my entire family was in the truck. Ford has issued a service bulletin about the issue with the vapor canister purge valve and its needing to be replaced. However, I believe this is a serious safety issue being that the vehicle stalls when reducing speed (such as turning into intersections with other oncoming traffic coming at you). There is no recall in lieu of this potentially dangerous situation they are causing. Additionally, this problem with the canister causes a tremendous vacuum on the fuel tank, so much that it damages internal components and has raised questions about whether it is affecting the stability of the actual tank itself. When you go to fuel the vehicle, there is so much of a vacuum that you hear it release the pressure when inserting the nozzle. Immediately after fueling, the vehicle will not start for several minutes. This issue needs to be corrected before someone is seriously injured or killed due to their vehicle sitting in the middle of a roadway and being hit by oncoming traffic.

- Lagrange, KY, USA

The contact owns a 2012 Ford F-150. The contact stated that during heavy rain and attempting to accelerate, the vehicle hesitated and stalled. The contact mentioned that the check engine light illuminate. The failure recurred three times. The vehicle was taken to the dealer. The technician was unable to diagnose the failure. However, he advised the contact to bring the vehicle back when it rained in order to duplicate the problem. The vehicle had not been repaired. The manufacturer was made aware of the problem. The approximate failure mileage was 6,000.

- Phornton, CO, USA

2012 Ford F-150. Consumer writes in regards to acceleration problems. The consumer stated as he tried to merge into traffic on the interstate, he floored the accelerator pedal, but the engine shut down completely. He was able to get the truck off the main interstate and into the emergency lane. The engine light came on. He let the truck sit in the off position for approximately 10 minutes and then he re-started the truck. At that point, he was slowly able to accelerate while in the emergency lane, to a speed that allowed him to re-enter the interstate. All attempts to accelerate quickly failed and it would only accelerate gradually at slower then normal speeds. He continued his trip with the engine light on and at his first opportunity he took the vehicle to the dealer. The dealer returned the vehicle to the consumer saying they had fixed the problem. The truck performed well for the next year without any incidents, there were no occasions where quick acceleration was required. In October 2013, he made another trip, and the same incident happened. Then engine shut down again in December 2013. The dealer stated they made a different repair and they returned the truck to the consumer. The engine shut down again in April 2014. The dealer kept the vehicle, for two weeks, stating they were unable to find a problem.

- Saint Petersburg, FL, USA

I experienced the exact problem you've already closed a case for. See link below. I narrowly escaped a bad accident. I think you need to reopen the case and force Ford to design a real fix (not a shield that disables the charge air cooler). You also need to force a recall before the accidents happen and lawsuits start. www.autoblog.com/2013/05/28/Ford-F-150-ecoboost-in-NHTSA-probe-for-acceleration-issue/.

- Middleton, MA, USA

The contact owns a 2012 Ford F-150. While driving 50 mph, the vehicle stalled and shook violently as the check engine indicator illuminated. The vehicle was taken to the dealer, who stated that a part in the inner cooler needed to be altered. The manufacturer was notified. The vehicle has not been repaired. The failure mileage was 63,000.

- Garner, IA, USA

My two children and I were driving up hwy 75 North from macon when we accelerated to the next lane. The speed limit is 70 so we were just going to pass in at a normal rate when the engine just quits and the whole car starts to shudder. Now I have had this happen at 19,000 miles and took it in to the dealership. This was only about two months ago. Went in today before I read all the complaints about this 3.5 eco boost engine and the similar problems I experienced. It was raining on when we had this happen but it occurred before with no rain. As the truck stopped and shuddered we were finally able to get to side of the road and did not get hit by oncoming traffic. There are six lanes of traffic in this area. Surprised today when I went to the dealership and told them what was happening and they didn't even know of the problems or have ever heard of it. "???" so based on what I have read I called back only to find out they have had issues.

- Atlanta, GA, USA

I was merging onto an interstate, accelerating from 20 mph to 65 mph to blend in with heavy traffic. The engine began to spit, sputter and shake and bogged down and wouldn't exceed 50mph. With a tractor trailer coming I had no other choice but to abort my merge and pull to the side of the road. I then waited for all traffic to subside before I made another attempt to pull onto the highway. I took the truck back to Ford. They could not duplicate the problem. I have had the truck in for many issues(slow speed shudder, high speed shudder, emergency brake issues, warped rotors, electronic problems, tire issues, acceleration hesitations, rough idle, failed brake pump, and more with less than 30, 000 miles) all of which Ford states are characteristics of the vehicle! this is my family vehicle that I Transport my 3 children and their friends. What will it take for Ford to resolve the problems they have with these trucks?! do people have to be killed before anything is done........ like with Chevy!!!!! Ford is covering up the issues they have with the #1 selling truck in America. It is a shame that people have a facebook page on the problems they have with their F150 because Ford covers up the problems because they don't know what to do to solve them. They told us it is a characteristic of the truck..........really!!!!!!!.

- Pittsburgh, PA, USA

The engine started misfiring and power loss.

- Morganton , GA, USA