I have a 2002 Mercedes c240 with 110,km. I had a plug wire changed last year it is now rough idling again? Replace all??
I had a rough idle about a year and a half ago. It luckily set off a light on my way to Mercedes and Rey fixed on spark plug wires they told me at the time others would have to be changed soon. Is this possible the problem no sign of engine mount or transmission or stalling? Should I just change all plugs and wires. ?