Hi, I have a C180 1.8L petrol 2005. My issue: When I get stuck in traffic, the engine heats up to 85°C and the engine idle is rough, the car shudders. If I switch the car off, leave for while, then re-start all is OK, until the next time I'm caught in traffic. Not good for city driving. Please advise on a step wise approach to diagnose and fix.
Many thanks!
Many thanks!
