I was on the enter state two lane thank god. It was raining and I started to accelerate to get around a big truck and my truck started to shudder and lost power all power. My truck has the 3.5 liter ecoboost engine. This is the third time this has happened to me.

- Cabot, AR, USA

Truck started to shake violently when accelerating. Felt as if the wheels were loose or the U joint for the drive shaft was going bad. Had to let off the gas. Has been ongoing from the time I purchased the vehicle to present time.

- Cottage Grove, MN, USA

While trying to merge onto the highway while under medium to heavy throttle my 2011 F-150 ecoboost lost all power while shuddering to the point it I had to abruptly get out of traffic and pull off the side of the road. As this was happening the check engine light started to flash and continued for a few minutes. After sitting for a few minutes the truck behaved almost normal as long as engine RPM was kept under 2500 above that it continued to miss and have a loss of power. By the time I got it home the cel was(is) on continuously. This all happened during rush hour on a very busy socal highway and could have been catastrophic.

- Milton, FL, USA

When I tried to accelerate the truck started to buck violently and lacked power. After releasing the gas pedal and coasting a bit I was able to slowly regain speed. It was raining at the time and had been raining most of the day on 12/29/14. We have not had a recurrence but have not had any rainy days either.

- Hobart, NY, USA

Under acceleration between 60-70 mph, trucks starts shuttering and decelerating. The check engine light starts blinking and will blink for about a minute before staying on. I was nearly rear ended by a semi entering the highway today as I was trying to accelerate up to highway speed and at approximately 65 mph, the truck started decelerating and shuttering down to 35 mph before I could get enough power to maintain that speed and get off to the side of the highway.

- Cincinnati, OH, USA

I was driving in highway traffic in the right hand lane at about 70-75 miles per hour. The weather was clear and the temperature was approximately 50 degrees. I encounter a slow moving vehicle and moved into the left hand lane and tried to promptly accelerate to pass a slower vehicle. When I attempted to accelerate the vehicle began to shake violently and go into a very rapid deceleration. The violent vibration of the entire vehicle and rapid deceleration made control a challenge. I moved to the right hand lane reduced speed to 50 mph and continued on to a Ford dealership to have the vehicle evaluated. The dealership found that 3 coils failed which caused the vehicle to vibrate and decelerate rapidly. I had the vehicle repaired.

- Aubrey, TX, USA

Under hard acceleration on the highway, the engine began to cut out and misfire, then the check engine light began to flash. I took the vehicle to the dealership and they said the innercooler had failed and needed to be replaced. Now, at roughly 55,000 miles it has begun to do it again, I had noticed it some before, but now it is worse. I took my 2011 F150 with the ecoboost to the dealership again and they said a tsb had been written and they changed the replaced the lower air deflector. This actually made the problem worse. At wide open throttle from a stop to about 80 mph, every gear will cut out and sometimes put the engine into a protection mode beginning around 4,000 RPM. If it shakes and shudders made enough the check engine light will flash, and now it has come on and stayed on. It has been very dangerous if I pull out to make a pass and then the engine shuts down and I can no longer accelerate. This has happened dozens of times, and has been addressed twice now by the dealership without any fix.

- Goshen , KY, USA

Going up a steep hill in Colorado on interstate I70 and the truck started hopping and lurching, dropping my speed from 60-40. The truck lost power almost causing me to be rear-ended on a busy highway. Due to the steepness of the climb, I had to pull over on the side of a busy highway. The dealership said this is a misfire common in the ecoboost trucks. This was the third time this happened going up a steep grade on a busy highway, causing power to decrease drastically. Truck had to be towed to a dealership. I was told it was cracked spark plugs, common in the ecoboost engine. I was very angry to find out I had to pay for the repairs as it is considered normal wear and tear and not under my extended warranty. I have read from other F150 ecoboost owners that this is a problem. Ford should cover this fix or reimburse those who have to pay for it. Regardless, this vehicle is not safe and should be fixed at no expense to the owner (especially when under warranty).

- Steamboat Springs, CO, USA

My truck has shuddering problems during acceleration to pass. The weather was rainy and very wet. This is not the first time I have experienced the problem. While visiting Louisiana in the summer of 2012 I experienced the same issue and while in san antonio, I had the catalytic converter replaced.

- Sandusky, OH, USA

I approaching an intersection and let off the gas, and started to slowdown several hundred yards before coming to intersection. The F-150 suddenly began to accelerate without my foot on the gas and my foot apply as hard as I could to the brake. The truck was accelerating on own. ABS kicked in and pulsed. But again truck was accelerating without my foot on the gas I complete made sure foot was removed and both feet on brakes. Attempted to pump and immediately after relating from brake as pumping to try and stop as hard stop didn't work it was like it was building up and shoot out like a bullet and hit car in front me. Once hit then quit accelerating. The front lifted up and full accelerating but feet were both on brakes. Lucky no one was hurt. Small damage to both vehicle because was as low speed intersection. If there wasn't a vehicle in front me. I would shot into intersection where only who knows what could have occurred to myself and others. This was a life threatening situation, that could have gone really bad.. end result could have been fatal. This needs to be investigated by Ford and no one else should be injured or lives taken from an issue that needs immediate attention and resolution to the vehicle owners that are scared to drive there vehicle because of this occurrence. Ford needs to make this right and make sure all vehicles this is reported on are safe or taken out of commission to make our roads safe for others and drives. [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Leeper, PA, USA

While accelerating up a hill, the engine began to misfire and would not accelerate properly and actually slowed while the service engine light blinked. I was forced to pull off the highway, shut the engine off and restarted. The check engine light did not re-light and I continued on normally until attempting to pass a vehicle when the same malfunction occurred. This happened repeatedly over the past 3 months while attempting hard acceleration until it was returned to the dealer for repairs. The dealer installed a "deflector" to prevent moisture from entering the turbo or aftercooler and reprogrammed the computer. Upon leaving the dealer, it was evident that the repairs did not work and the problem became worse. The engine misfires constantly resulting in an unsafe vehicle.

- Imperial, PA, USA

We were merging onto the highway outside of St. Louis mo and when the accelerator was fully depressed the engine started to misfire and power was reduced. A blinking cel was displaying on the dashboard. It seemed as though the turbo system was not adding any extra charge to the ambient air. There was a pronounced vibration to the vehicle that seemed to originate from the engine/drive train. Luckily there as not a lot of traffic at the time and our poor acceleration did not result in an accident. My solution was to manually select the gears and drive at much higher RPM. This smoothed the misfire and we had an adequate amount of power to keep up with traffic. After about 10 minutes everything smoothed out and the misfire was gone. Truck behavior returned to normal. The weather that day was a pleasant 60 degrees and sunny. The previous day we drove from central Ohio to St. Louis through much rain and fog. Since we were on vacation and away from home we did not take the truck to a dealer to be serviced. The problem has not occurred since then. There was one previous occurrence at a previous date. I don't know exactly when it was. We were traveling home to vt from Ohio. We had been driving for many hours, mostly on highway/cruise control driving. We had just gotten off the interstate highway and were on state highway. I went to pass a slower vehicle in my lane and upon depressing the accelerator the engine seemed to misfire (RPM went up but power delivery fell flat). I stepped off the gas pedal and slowly pressed a second time and this time the truck responded as expected. There was no cel this time. Each of these incidents occurred with my entire family in the vehicle. We were not very happy about it and did not feel safe at the time.

- Essex Junction, VT, USA

I was driving 70 mph up a hill when my truck started hesitating and my speed started to rapidly drop. I was in the fast lane and was forced to make my way to the right shoulder under a major power loss. The problem has since happened multiple time when I accelerate rapidly or under a load.

- San Bernardino , CA, USA

Sometimes when I try to pass the engine during full acceleration stumbles and looses acceleration. It does not happen all the time and does not give an error code in the computer. Very dangerous on two lane road passing.

- Sugar Land, TX, USA

While merging into traffic the engine began to loose power and misfire. The vehicle entered "limp home" mode, noted by a flashing check engine light. The vehicle was taken to the Ford dealership and simply had the error codes cleared. Similar incident occurred few months later and the vehicle underwent recommended repair/upgrade per Ford tsb including intercooler cover and reflash of computer. For past week vehicle has had persistent power loss and "shuttering" during acceleration. This not only limits the drivability of the vehicle, it also endangers the occupants when attempting to merge with traffic and crossing intersections. The dealership is aware of the problem, however there seems to be no effort to find a "complete and lasting" solution.

- Gray, GA, USA

2011 F-150 with 3.5 liter ecoboost engine. Truck had been driven approximately 20 miles in the rain. Stopped at a traffic light and then proceeded to turn left. Accelerated up a hill on a 2 line highway and truck began to shake violently and lost all power in a moving lane of traffic. A check engine light came on. Pulled to the side of road and after a minute truck cleared up and drove normal. Currently the truck surges under moderate acceleration and in 3rd gear will go into limp mode and lose all power. Only occurs under moderate acceleration.

- Montgomery, TX, USA

Ecoboost engine stutters when accelerating. Can not pass or continue driving.

- Austin, TX, USA

While in wet conditions truck will stall, loose power, and shutter. While driving up a hill on busy interstate the truck stalled. Had to take foot off accelerator to get the truck to go. We were almost rear ended because of this. This has happened many times!

- Marshfield, MO, USA

While merging onto the highway, the truck shuddered violently and slowed to about 10 mph. I released the throttle and gently reapplied it and it ran fine. I took it to dealer and they couldn't replicate it. The event has happened since, but check engine light doesn't stay on, so Ford unwilling to do anything about it.

- Oxford, OH, USA

While traveling a two lane hwy, on rt 81 from Tennessee to Virginia in the early hours of the morning, we were pulling our 24 foot camping trailer, we were behind a tt unit and there was a tt unit behind us, we were all attempting to pass a slower mv in the right hand lane, when I tried to accelerate the truck shuddered and the engine completely went limp, the engine light came on and we were barley able to make it to the side of the road, and prevent an accident, . when we did get to the side of the road the engine light continued to flash and the truck was not running..

- Millbury , MA, USA