I have the same problem but not as severe. My xt definatly wiggles more than any other car I've been in. I haven't had the keys actually jingle, but its enough to make you dizzy if you're reading a newspaper. You can actually see the car wiggling from outside. I just tell passengers it has a hot cam. The dealer claims the eratic idle is normal because it has heavy pistons. If this were the reason (I really doubt it is), the idle should be consistantly lumpy. At least it was documented with the dealership incase I have problems later. Ive owned several Porsche and Subaru flat fours, sixes and turbos, never had such an embarrasing idle.