While driving at highway speeds and attempting to pass a slower car, the truck lost 50% of its power. It began to miss fire, and act like it had bad gas or something. I also started to notice that if you turn a corner on wet pavement and you lose traction, the truck made the same gurgling sound with power loss. This has happened several times. I have also noticed that I get very bad gas mileage averaging 12 mpg on the highway. I took the truck in and they reprogrammed it. I think all this did was cut back the power to help prevent detonation or miss fires. After this the truck was a complete dog. Bad mileage and no power. I recently sent the truck back and they replaced some parts with the intercooler. It isn't 100% fixed but it is better. Mileage picked up to 15 mpg but nowhere near what they claim. Power is better but still not good. Very disappointed overall.

- Houston, TX, USA

Intermittent stumble/misfire on acceleration from highway speeds, engine feels like it is in limp mode, this has happened four times.

- Bridge City, TX, USA

Engine stalled during hard acceleration. It had been sitting idling to warm up on a cold morning. When pulling onto the highway and accelerating to move into traffic, the engine stuttered and stalled. Had to pull over out of traffic.

- Madison, MS, USA

Pulling on the highway and accelerating the truck seems to hesitate when you need the power. This particular day was humid but it happens sometimes in clear weather.

- Aledo, TX, USA

Incident 1. weather: Cloudy with some snow around 20 degrees.when accelerating on to interstate 70 in E. Illinois the engine stumbled and loss power. The on ramp had an uphill grade and when the vehicle hit 35-40 mph, it lost all power and sounded like it was struggling to get fuel. I was able to pull to the side of the road, put it in park. I tried to rev the engine in park but it would just stumble. I turned the engine off and waited a few minutes then restarted it and it and it seemed to work as expected. This has happened 3 times since March 4th with the last time being on May 9th. Incident 2. weather: Partly cloudy in the 30's., March 7th, same conditions as above engine stumbled and loss power accelerating on to interstate 376 in w. pa incident 3. weather: Nighttime, in the 60's. going around 30 mph flat road, speed changed to 55 mph tried to accelerate to the posted speed and again the engine stumbled and loss power. This time the dashboard lit up with a bunch of codes (didn't write them down) again turning the engine off and waiting a few minutes seemed to clear the condition. *note* due to a heavy work schedule and needing my vehicle I have not had a chance to get my vehicle into the dealer to have them look at it yet.

- Beaver, PA, USA

In a light rain I tried to pass a truck but when I pushed on the gas the engine stalled. I was lucky to get back in my driving lane. This has happened 4 times, three while attempting a pass. I am now reluctant to attempt a pass.

- Springfield, MO, USA

Loss of power while driving, ... this has happened several times and the dealership (joe machens Ford) denies any problem with truck. This has also happened to my son [xxx]2012 F-150 and he has been told there's nothing wrong also. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Columbia , MO, USA

After driving all day in the rain, I went up a freeway on-ramp accelerating to merge with traffic. Engine started shaking badly, and lost almost all power. I moved to the right safety lane to get out of traffic. After about one minute the engine regained power, stopped shaking, and I was able to continue normally. I went online and discovered that many F150 ecoboost owners have the same problem but Ford refuses to acknowledge the issue, and does not offer a recall or standard fix. So I just avoid hard acceleration on rainy days and have not had the issue again. It is a dangerous problem though.

- Reedville, VA, USA

My wife and I were coming home going about 55 mph and I went to pass a slower car. As I pulled on the passing lane and went to pass the engine start to cut out the more I pushed on the accelator the slower the truck went. It has done this two more time. I'm fixing to take to Ford in a few weeks. This could be a safety problem the truck has the 3.5 eco engine.

- Pierre Part, LA, USA

Multiple acceleration issues, especially when attempting to pass another vehicle and/or when accelerating abruptly. I have also noticed condensation from the exhaust when first starting the vehicle in the morning on multiple occasions.

- College Station, TX, USA

Straightening our vehicle in parking place at home depot. Slowly (~2mph) going forward with foot on brake when engine suddenly speed up. Mashed down hard on brake while shifting into neutral. Tires or clutch screaming so loud it drew a group of yardmen unloading a truck nearby. Shortly after getting it shifted into neutral engine resumed normal operation. Took to Ford dealer immediately and will be evaluated after the holiday. Several times in the week prior to incident I noticed some slight "stuttering" of the vehicle when slowly moving forward to park in driveway, also noticed for the past 1 to 1.5 months there has been a 2+ mile per gallon decrease in fuel mileage running over the same routes.

- Sacramento, CA, USA

I was merging into traffic on I-10 in Florida from an entrance ramp. I was going 55 mph when I had to accelerate in order to merge with traffic. Upon attempting to accelerate, the engine lost power and began to shake causing me to have to brake really hard and move to the shoulder of the road so that I wouldn't collide with traffic already moving at 70 mph in the lane I was attempting to merge. This is the first of several incidences in which the vehicle lost power under acceleration.

- Crestview, FL, USA

Driving in raining conditions, when accelerating I would loose power when the turbo chargers kicked in. It was as if the turbo chargers were picking up the moisture causing the engine to misfire and would loose all power for acceleration. Even after the rain stopped, this acceleration problem stayed with the vehicle for the remainder of the trip. The next morning, still had same problem but as the temperature went up and humidity decreased the problem got less severe and by the end of the second day the acceleration had returned to normal. The first occurrence was when I was passing a semi trailer, I tried to pull out around in passing zone on a single lane in each direction, when the engine didn't respond I had to break and fall back being the semi. Luckily, this occurred as I pulled out to pass the semi, if it had happened after I along side of the semi, there would have been no way to accelerate to pass the semi or return to my side of the road before the oncoming traffic arrived. I have heard of other individuals experiencing the same during raining conditions and don't understand why Ford has not issued a fix for this problem.

- Rockwall, TX, USA

Losing power, vehicle shake, check engine light. Je demeure au quebec, je parle francais. Si vous avez D autre info a me demander, N hesiter pas.

- Sept-Iles, CT, USA

My wife and I were driving in Maine on vacation hauling a 3600 lb 14 foot camper. It was early evening and raining, I was in a flat area coming into a steep hill so I accelerated hard and the engine staggered hard. It was like a hammering for several seconds and a total loss of acceleration. I thought I had actually broken the engine some how. A few seconds later the hammering stopped and the truck returned to normal. When I talked to my Ford tech about it he said it was bad gas. The engine since then has had a ticking sound that the tech says is the fuel injectors working, I'm not so sure since it did not make that sound before the above described incident. It has not recurred, but I have been careful not to expose the vehicle to hard acceleration again, but that hardly seems to be an appropriate solution.

- Madison, WI, USA

Truck has 3.5L ecoboost V6 engine. 18 May 2013. Was traveling on two lane highway in central Georgia. Pulling a 3000 lb utility trailer. Had been driving in light rain for about one hour. Speed limit was 55. I was following a car that was going about 45 mph. When I got to a slight uphill grade there was a passing lane available and clear of other vehicles. I pulled to the left lane to pass the slower vehicle in front of me. I pressed the accelerator about 3/4 down to attempt a downshift of gears. The truck immediately began vibrating/shuddering and lost almost all power. I pulled back to the right lane and held light pressure on the accelerator and was able to maintain about 20 mph speed. I held the throttle steady and after about two minutes the engine regained full power and I proceeded on my trip.

- Perry, GA, USA

I was driving on a 2 lane highway, behind a semi truck, with several cars behind me. We came to a passing zone and I began to pass the semi truck. I moved to the oncoming lane and accelerated, but the truck lost power. I began slowing down in the on coming lane, but couldn't return to the right lane because the vehicles that were behind me were passing me in the right lane and I had a vehicle directly behind me that was followed me to pass the semi truck. I locked out 5th and 6th gears on the transmission to gain some RPM but the vehicle started to shudder violently. I moved to the shoulder of the on coming lane and shut the vehicle off. I sat on the shoulder for several minutes, got out of the vehicle and checked under it for fluids. There were no fluids under the vehicle. All the gauges read normal. I did all this on the shoulder of the oncoming lane facing oncoming traffic. This was not a good position to be in. I started the vehicle, put it in gear to see if it would move, it did. I had full power and got back into traffic and the truck ran fine. No warning lights, no indication that anything was wrong. Several miles later I lost engine power again, and again got the violent shudder, and the check engine light came on. Going to see the dealer today. This is bad! the first incident could have caused a huge accident. Moving onto that left shoulder proved to be a good move, but I was at pucker factor 10 for a few seconds.

- Newburg, MO, USA

The contact owns a 2012 Ford F150. The contact stated that the vehicle lost acceleration power while towing a boat. The contact was able to shift the gear manually and regain acceleration. The vehicle was taken to the dealer to have a diagnostic performed, which was unable to locate a failure code. The dealer also test drove the vehicle and was unable to duplicate the failure. The contact stated that moisture penetrated the eco-boost and caused the vehicle to lose acceleration. The manufacturer was not made aware of the failure. The failure mileage was 28,000 and the approximate current mileage was 28,300.

- Wheelersburg , OH, USA

The contact owns a 2012 Ford F-150. The contact stated that while driving 30 mph, the contact attempted to accelerate but the vehicle decelerated and shook violently. The vehicle was taken to the dealer where it was diagnosed that the ecoboost chamber was defective and needed to be replaced. The manufacturer was not made aware of the failure. The vehicle was repaired. The failure mileage was 4,000 and the current mileage was 9,000.

- Ocala, FL, USA

On Monday December 11, my wife and I left on a trip to Indiana with approximately 10,400 miles on the truck. After a stop, at the bowling green, ky., rest stop, I proceeded to return to traffic on interstate 65. After determining I could safely accelerate in front of two semi-trailer trucks, I entered the highway at approximately 50 mph and went to full throttle. Instead of accelerating, the engine went into a total loss of power. Amid the blowing of air horns and my wife's screams I was lucky enough to avoid a collision by yanking the truck onto the emergency lane. The engine did not stop running, but appeared (to me) to be totally flooded. The engine ran on ?? (number of) cylinders for approximately one eighth of a mile before returning to running on all cylinders. I do not think the service department believed me when they looked at the truck. I have been a mechanic and an engineer for a lot of years, I know what happened this time and it came very close to a serious accident and/ or injury to my wife and me. This was a very close accident avoidance and it practically destroyed our confidence in the truck. While still on our trip, we made the decision to forgo the hassle of trying to persuade the service dept. There was a problem, and get a different brand of new truck. I have taken the high financial loss of trading for another new truck. I am not totally satisfied with this vehicle. The Ford has many enhancements and I probably should have tried harder to get the appropriate service action. But would it have been worth the risk of another engine incident, no I do not think so. This was the second and most serious incident and after Ford service had pronounced there was no problem with my engine. I sold the truck with 11,399 miles on the speedometer.

- Killen, AL, USA