I need help on my 86 260E. When the car is at idle with A/C off, the engine seems to be hesitating, somewhat like a misfire. When driving, its feels normal. When the A/C is turned on and at idle, the car experience slighter hestitation. The car has just recently undergone head and valve job and plugs are new too. Would adjusting plug gaps as posted earlier help or changing ignition coil and plug cables help too?
Thnx in advance for any replys!