The air flow sensor will cause this. Is the idle OK and steady when out of gear? Does the deceleratin fuel shut off work? You will know if the fuel management is OK if these things are OK.

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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