The first time this happened, my husband was pulling out into a center turn lane in order to merge with traffic and the motor cut out and bogged down. Just four days later, I had the same experience where the motor completely cut out while I was going through a yield sign, slowing down, and then getting on the accelerator to increase speed. I counted between 3-5 seconds before the truck started accelerating again. This is very dangerous and had someone been right behind me it could've been a bad wreck. It happened to me this first time right after I picked my truck up from the dealership and them telling me my VIN didn't qualify for the tsb with replacing the cac (intercooler) and adding the air deflector plate. I have since gone to a second dealership and they are performing the tsb for me after having my truck for 5 days now, and being able to reproduce the problem easily. I hope this fixes it. I've already had a check engine light come on and my driver's side catalytic converter was replaced. I've had numerous leaks all under the 36,000 mile warranty - front main seal, transmission leak, rear diff leak, and even some deteriorating rubber gaskets in the doors, and am seriously questioning Ford's quality these days.

- Cedar Park, TX, USA

This truck has the 3.5 liter V6 ecoboost engine. The truck is company owned by wl hall co. I was accelerating while attempting to pass another vehicle. The vehicle lost power then started to shake, shudder and jerk. The check engine light came on and the vehicle's engine started to run very roughly. This happened again at approximately 9,700 miles, 28,000 miles and 60,000 miles. Ford has attempted to fix the issue three times. The truck will be going in for service for this issue a fourth time. Due to improper performance, this issue almost caused an accident this last time. There have also been numerous incidents over the life of the vehicle where it did not shift properly and dropped power, but then the vehicle corrected itself.

- Hopkins, MN, USA

After cruising at 50 mph for about 10 minutes, temperature of 87 degrees with high humidity, I attempted to pass the vehicle ahead of me. The truck accelerated nicely, then stumbled, stopped accelerating and started to shake violently. The check engine light began flashing, indicating a misfire. Problem corrected itself after 30 seconds and truck resumed normal operation.

- Palatine, IL, USA

Just purchased used Ford F150 supercrew with ecoboost engine with 26,000+ miles a week ago. I first noticed a shudder in the rear end when backing out of my driveway a couple days ago. Felt like driving over a washboard. Did not pay a lot of attention to it as I had not noticed it before. Went on 575 mile trip over the weekend and this shuddering persisted while pulling up to stops and starting out, both turning and going straight. Only occurs 65% of the time but the shuddering is very intense at low speed but appears to get better at cruising speeds. You can hear and feel the shuddering.

- Sioux Falls, SD, USA

Traveling on 4 lane highway during period of train, accelerated to pass vehicles, my truck eco-boost motor acceleration stagnated and vehicle began to shutter, was unable to pass, decelerated and stagnation stopped. Incident occurred when ever I tried to accelerated during active rain during a 9 hour interstate trip.

- Spring Lake, ND, USA

While merging into traffic on the expressway today in miami, at about 35 mph, I had to accelerate to get out of the merging lane, at which time (for the third time since I bought the truck in 2011) the truck lost all power to the engine (a 3.5L ecoboost) and began to sputter, shake, and decelerate. Luckily for myself and the other drivers on the road I did leave a sufficient gap between myself and the car to my rear to give that vehicle time to react to what equates to a vehicle pulling out in front of him/her and gently pressing the brakes without the brake lights engaging. My truck hovered between 25 and 30 mph for about 30 seconds with it doing the sputtering and slowing thing each time I attempted to accelerate during that time period. After pretty much coasting for 30 or so seconds, the truck sprang back to life and drove as advertised. From what I've read, this is not an isolated incident and I (as well as others) believe Ford should be held accountable for this defect. I'm not looking for a new truck, I'd just like the problem fixed. Even though no deaths or injuries have been reported due to this "yet", you can see the danger of having your engine loose power when you need it the most. Unfortunately for their customers, all Ford seems to be concerned with is the loss of a buck......not the loss of a life!!! [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Sunrise, FL, USA

I was traveling in the righthand lane of the East bound side of I24 around manchester, tn. My speed was approximately 65-70 mph. I suddenly came up upon slower traffic in the same lane and signaled to pass the slower traffic. As I looked in my mirrors for traffic behind me I noticed another vehicle closing on me in a hurry. I depressed the accelerator to gain speed and make the pass. The vehicle lurched and the motor suddenly shut down and wouldn't accelerate in the middle of my pass. The vehicle behind me locked their brakes and managed to slow their vehicle down before possibly colliding with me. I let the slower traffic on the right pass and signaled to get back in the right hand lane. This has happened twice to me and I think there is a real possibility this could endanger lives and property if not corrected. My 2011 Ford F-150 is equipped with the 3.5 liter ecoboost V6.

- Hillsboro, TN, USA

The contact owns a 2011 Ford F-150. The contact stated that while driving approximately 55 mph, the vehicle would no longer accelerate. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure mileage was 39,000.

- Chatsworth, GA, USA

The contact owns a 2011 Ford F-150. The contact stated when the vehicle was turned on the engine idled excessively and the began to smoke. The failure was experienced numerous times. The vehicle also stalled while driving approximately 20 mph. The contact was a able to drive onto the emergency lane and restart the vehicle; however, when the accelerator pedal was depressed the transmission disengaged and the rpms increased. The vehicle was taken to the dealer for diagnostic testing but they were unable to locate the failure. The dealer replaced the turbo charger line; yet, the failure was not corrected. The manufacturer was made aware of the failure. The failure mileage was 20,000. The current mileage was 23,800.

- Paris , TX, USA

My Ford F150 eco boost lost power suddenly while trying to enter a rural route at a stop sign.while trying to accelerate it just died for several seconds and then took off since I was pushing on the accelerator wondering what had just happened.the vehicle has been shuddering a lot on acceleration now with a substantial loss of fuel economy. I have personally had it at two Ford dealership which say they can find no problem with it, but shop foreman told me and my wife we where stuck with it and to fix it by pulling the battery cable off every once in awhile.

- Rhoadesville, VA, USA

I was driving at highway speed, and accelerated rapidly to get out of the way of a merging car. The truck shook violently and lost power. I pulled to the side of the road and restarted the vehicle. There was no "check engine light" or any other indicator of a problem during the incident, or after restarting the truck. When I took it to the dealer, they indicated that they found nothing wrong with it. I have driven the truck since then wondering if it would happen again. Now I see that others are experiencing the same issue. Kistler Ford in toledo, Ohio will have a record of this service appointment on 10-21-11, as I have a copy of the service document stating the above. Although I have no way to prove it, the truck has also seemed to have less power since this incident.

- Swanton, OH, USA

Vehicle began shuddering heavy between 40mph and 50mph. Requiring me to depress the gas pedal heavy to avoid the shuddering, its almost impossible to drive my vehicle at 45 mph (which is the speed limit in most of the area I drive in). This occurrence is when 5th gear changing to 6th gear, which is typical between 45 mph. Not sure what damage this is doing to my vehicle, let alone the safety risk this may be causing. I have had the vehicle in the dealership at lease 6 times for this issue and with no results of the issue being resolved. Just the run around and false promises. 2011 F150 5.0 motor and 3.55 gear ratio.

- Miami, FL, USA

Vehicle shifts hard when not under power. When under power vehicle backfires, mis fires, loses acceleration completely. Have brought vehicle to deal 4 times and have been told there is nothing they can do. There is black sut on the exhaust. I do not feel safe driving in the vehicle if it cannot accelerate or will just completely shut off.

- Cooper City, FL, USA

Truck lost all fluid from transmission. Ford replace seal in transmission after sitting at dealer for nearly 3 weeks. Since that time, I have made multiple complaints to local dealer about engine stumble on hard acceleration. Dealer replaced air deflector per Ford service bulletin. Truck still stumbles on hard acceleration. (06/01/2013) current mileage 40,900.

- Ooltewah, TN, USA

The contact owns a 2011 Ford F150. The contact stated that while driving 65 mph and attempting to change lanes, the vehicle lost acceleration power. The failure was experienced several times. The vehicle was not taken to the dealer to have a diagnostic performed. The manufacturer was not made aware of the failure. The failure and current mileage was 48,000.

- Milano , TX, USA

The contact owns a 2011 Ford F-150. The contact stated that while shifting gears, the vehicle would violently lunge forward without warning. The vehicle was taken to the dealer where the failure was unable to be replicated. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure mileage was 14,000 and the current mileage was 40,000.

- Litchfield, IL, USA

The contact owned a 2011 Ford F-150. The contact stated that while driving approximately 35 mph, the vehicle hesitated to accelerate. The failure recurred intermittently at different speeds. The vehicle was towed to the dealer for diagnosis three different times. The technician was unable to diagnose the failure. Additionally, the contact stated that the fuel gauge would not display accurate fuel readings. The vehicle was taken to the dealer for diagnosis. The fuel sensor was replaced. The vehicle was not repaired. The VIN was not available. The approximate failure mileage was 4,000.

- Donalds, SC, USA

The contact owns a 2011 Ford F-150. The contact stated that whenever shifting from first to second or from third to fourth gear, the transmission shook violently. The vehicle was taken to the dealer where the technician was unable to determine a remedy the failure. The manufacturer was made aware of the failure. The vehicle was not repaired. The failure mileage was 15,406 and the current mileage was 21,500.

- Essex, MD, USA

An example of what happens is this: Traveling along at 45mph, and pull out to overtake a slower vehicle, you accelerate aggressively. Upon doing this, the truck seems to stumble like it's hunting for the appropriate gear (@ about 45- 50mph). Also, it feels like an engine mis-fire. It's a disconcerting feeling that the truck does not accelerate as it should when you need it the most.

- Hershey, PA, USA

Loss of power while attempting to pass on three separate occasions. In all occasions I had to pull over and turn the vehicle off, let sit for a few minutes and then restart the vehicle to continue.

- Wynne, AR, USA