I was driving up the road one day with my A/C on. When I stopped at the stop light the whole car was vibrating. Steering wheel was going up and down. Took it back to the dealer and they said that they reprogrammed the PCM. Fixed that. Today when I started it up it was so loud it sounded like a big truck. Check Engine Light started flashing and a MAJOR loss of power. Just left it with the dealer to see whats wrong.

Update from Aug 7, 2011: Dealer could not fix the problem. They Tried 4 different times to get it fixed. Every time the CEL would come back on and start vibrating again, The car also started running hard and burning a ton of gas. They offered to refund my money and I purchased a Mazda CX-7 and couldn't be happier. I will never buy anything Ford made again!