Originally Posted by Gamedog

You know what to be honest mine does the same thing. When I'm cruisin at around 65ish, the car starts to BARELY vibrate. And when i give it just A HAIR of throttle, the car starts vibrating a lot worse. But when I give it about half throttle, the vibration goes away until I come to a constant cruising speed. After about 3 seconds, it starts BARELY vibrating again. And when I decelerate it goes away completely until I give it gas. Kinda hard to explain, but I along with my GF feel it when on the highway. Its to the point where my radar detector shakes like crazy. Been meaning to take it into the dealer to get it checked out. Not my wheels, not my alignment.

Good luck OP and I'm anxious to see what they find out.