UGH ever since this new motor has been in (2 weeks) it has run beautifully, but whenever i give the car gas and hold it at a certain RPM, the whole damn car shakes and gets worse as it picks up speed, and it happens whether you pin it or just slowly pick up speed...........but as soon as you let off the gas and let the car coast it drives fine..........its whenever you are acelerating. I really need to fix this it is VERY annoying.....THANKS IN ADVANCE I HOPE SOMEONE CAN HELP!!