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Q:

rough idel on 2003 Mercedes-Benz C240

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the car run great, but at idel run rough. nor sure if filter
air or fuel. 80k miles. engine check light on dash
(1) Answer
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.