2007 F150 Harley Davidson loss of engine power and severe off balance feeling in the engine. Driving along everything was normal, stopped at a light, and when I took off I had 1/2 the power. When I tried to accelerate the entire truck shook and felt like something was out of balance real bad. About two blocks later the check engine light came on. The truck has a self test feature and went through the tests with everything saying it was okay. When I say it had an out of balance feeling I mean everything in the center console and the glove box was sloshing around and rattling. Usually you never hear anything in this truck. It's a very smooth ride all of the time. But I made it home and something is terrrrribly wrong. Can someone help?