I had a look at the injectors in my 300D -- the part number is NA31X, which I believe is for turbo engines. Forgot to mention that while the car is originally N/A, it came with a shotty ghetto-looking aftermarket turbo unit and I assumed by what a terrible job they did that the injectors were still original but perhaps not.

Maybe I'm better off cleaning the injectors and replacing the nozzles myself...hopefully someone in this town can pop-test them.

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1985 190D 2.2L 717.411 5-speed
1983 300D Euro OM617.950