The 74 and the 78 have different fuel managment systems!! I agree with Aaron on the warm up compensator.
After you check it we can get you one.
We can ship them anywhere via partsshop.

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