I have a 93 sts and when I am going about 55 or so and leave my foot off the gas it kinda does a jerking thing and sometimes when I leave my foot off the gas it just quits. My mechanic doesn't know alot about the northstar engine so he is not much help and I can't afford to take it to a cadi dealer. I have had this car for 2 yrs and this problem isn't getting any worse. Some say it is the driver and not the car. I know these engines go from 4 to 6 or 8 cylinders but the car shouldn't jerk. I was wondering if anyone else had this problem. Thanks for any comments