This is best left to the dealer. Many independent techs even have a hard time witht the EA (electronic accelerator) because of how complex it all is. Many times you will see problems like this that can be caused by faulty distributor caps though. You can remove them with a 5mm allen and inspect. Any green stuff and they are gone.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM