Hi

Figured out why my 190E 2.6 was stalling( similar cars) and this what i did.

1. Checked the MAS and OVP
2. Checked all fuel system components
3. Fuel pumps and replaced the fuel filtee
4. I connected a home made tester to the diagnostic socket and got the number of blinks which me to the back of the car.
5. Heard air bubbles in the fuel pump area. Checked the gas tank(removed and cleaned, drained gas) and found that the filter inside the tank was all gummed and clogged up. Replaced it and the car ran agian.

I brought to a mechanic speciazling in mercedes to have the lambda adjusted and the car runs like new.

Also, before replacing any part be sure to make sure its not working. Replacing OVP and mas MAY NOT SOLVE YOUR PROBLEM so dont run out and buy expensive parts.

Hope this helps

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)