I have a 1995 e320 that has a slight misfire at idle. It has become more consistent lately and you can lessen its occurrence if you put the car in park or neutral while you are sitting at a light. The car runs fine. No hiccups or other symptoms. This is only when you are sitting at a light and it is like the engine is skipping a beat every minute or so.

My first thought is coils. The coils have been replaced a couple of years ago and the infamous wiring harness was replaced about the same time. The plugs are exactly what my mechanic recommended, though I cannot remember the exact plug id.

Any usual suspects I should round up?

Thanks very much,
Jim Lee