My 94 E320 had a 035 code. Replaced the Engine Control module and that fixed the problem. You should have a check engine light with code 035.

You can start with the O2 sensors, mass air flow sensor, vaccum leaks, fuel pressure, if everything checks out, replace the ECM and see if adaptation numbers change.

Your DM should be giving you a code 19, along with 3 and/or 4.

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Zafar
94 E320 58000 Miles