I have 140,000 miles on my Eclipse. I like it but little things are starting to show sign of wear.I have a very noticeable vibration when I am at a stop with the car in gear. Pretty bad sometimes. I have replaced the motor mounts as they were a little worn. But I still have the bad vibration. Can anyone figure this one out for me? I have cleaned my throttle body and my plugs and wires are good. I have read that it might be the IAC (Idle Air Control). Unfortunetly this part is about $260 at Autozone. I would like to wait and see if it might be something else before is spend that much. I don't see any vacuum leaks. Please advise. Thanks.