When engine start idling sometime it shake moderately and and sometimes normal, Why??
Not enough information. You didn't even say what car, year, etc.
Hi! I have a Mercedes c class 230...2004. My car has a rough idle, and when it does the lights seem to go bright n then dim. It hasn't stopped but I am a single mother who knows nothing about cars, and get taken advantage of alot. So I would REALLY like some advice on an effective but inexpensive way to repair my car. HELP!!!