hmm
Sounds like my problem I had with my 1990 190E 2.6 It turned out to be a cracked hose going to the icv. After checking all the electronics and the fuel pumps, replacing the mas and ovp.

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