The engine's control system is in limp mode. You have to check every single component to figure it out. I have seen altitude capsules cause this, air plate sensor can cause this, and so on.

If you are near Atlanta, I can repair it.

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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