Cazzzidy, good to see you again.
I don't know squat about turbos, cause I have never had one.
But if that was my car, the first thing I would do is put the fuel system back to stock, change all filters -pull the tank strainer and clean, put fresh diesel in there, and see how she runs. Make sure it isn't the conversion. Then I would consider an injector swap, if you can get a loaner set.

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Think Alternative Energy!
300CD '80 (now gone but not forgotten...)