While driving my 2012 Ford F150 4X4 with the ecoboost motor to work on the garden state parkway I experienced the following issue: After cruising for about 20 miles at 65mpg I attempted a pass of slower moving traffic. The truck accelerated to about 80mph during the pass then suddenly the engine lost power and created an engine breaking situation. The trucks' speed dropped rapidly from 80 to 60mph and I had to abruptly move into the slow lane cutting off other cars to avoid being rear ended. As soon as the power/speed loss occurred the truck began to shake violently for about a minute or two until I eventually slowed to about 50mph. This has happened 2 times since owning the vehicle. The truck has 5000 miles presently and has been back to the Ford dealership 3 times for software updates, a catalytic converter replacement, to add an air deflector and it continues to throw codes and turn on the check engine light. I got it back yesterday and the check engine light went on again on my drive home. Also mileage seems to becoming progressively worse. I try to avoid passing situations as much as possible in fear the vehicle will create a dangerous situation for myself and other drivers on the garden state parkway.

- Toms River, NJ, USA

When accelerating the truck bogged. RPM of engine increase truck did not. Let off gas and depressed truck began to shake violently. Attempting to merge on interstate. Had to pull over and shut truck off to return to normal. This has happened several occasions. I have documented each time it has happened with more details each time. Ford has looked at truck several times. Latest word is that they have a problem, started a tsb however there isn't a fix available. This is very dangerous when driving especially on the interstate when changing lanes or merging from ramp. There is not any warning and scares the devil out of the driver.

- Mckean, PA, USA