Hi

I have C180K that has been idling unstable. Checked the engine diagnostic to reveal "misfire on # 1 & 4 cylinders". As semi-technical person I have changed the sparks plugs as first line due them being old. It has not curred the problem, I have the same errors including misfire on #3.

I am guessing its not the coils at this stage, what else could be causing the issue ???????

PS. While driving it seems to run fine with no noticable intermittant or constant misfire.

Regards, Steve.