Ok i got a question. i have an 04 f-150 5.4l and when im goin down the highway or the road and i have been goin a certain speed for a while and i press the gas down a little bit my truck FEELS like its having a hard time going faster the engine and hood area jump up and its loud. But when i let go of the gas and let the RPM drop down then press then gas its fine... Sorry about the bad explanation but it hard to explain....