Sounds like what Im going through with my 190E 2.6, major and expensive repair one after another, Ive put over 4 grand in the car and I still dont have reliable transportation. After I fix the current problem I will most likely sell it since it isnt panning out to well. For me mercedes desiels are the way to go. Dont have to work on them constantly and reliable.

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