Had seen previous post regarding idle speed that revs up and down while vehicle is in park and idling.

Please advise what needs to be done to remedy as unable to locate old post. Only does it after vehicle warmed up and whicle sitting in park idling..Thanks Mike

A couple of things,
1 the idle speed acuator
2 air plate position indicator
3 throttle switch
M103?

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Thanks Benzmac,

It is 1988 300e w/ 149,000 miles.

What is the year and model of the car in question?
Randy D.

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W.R.Durrance
ASE Master Tech
Mercedes Tech 19 Years

Randy D.,

I noticed that I left that off my original post. I am sure it would help and I responded about the same time you did. 1988 300E with 149,000 miles. Only does it after vehicle is warm and idling in park.