i had a similar problem to that and i still havent found the problem differnce now is mine now shakes and throttles at all times even on freeway :( the check engine light comes on and starts flashing, and the vsc and vsc off lights stay on, i havent had this problem till i came back from the movies, now i dont bother running it till i find out what the problem can be any takers?
or just say screw it and take it in?
save time and stress lol