rough idel on 2003 Mercedes-Benz C240

the car run great, but at idel run rough. nor sure if filter
air or fuel. 80k miles. engine check light on dash

Asked by for the 2003 Mercedes-Benz C240
Need to get those Check Engine Light Codes, that will REALLY help you to solve the rough idle, which sounds like it could be a misfire problem. Does the Check Engine Light ever blink, because that is indicates a severe misfire problem that is ruining your Catalytic Converters, which on a Mercedes is very $$ expensive.