Did you check fuel pressure and for leaks in the fuel system?

Recently solved a stalling problem in the 1991 190E 2.6 by checking fuel pressure and saw that the pressure wouldnt hold and sure enough it was leaking @ the fuel pumps.

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