Getting the injectors pop tested is critical for good running. As is correcting any (even slight) fuel leaks -- they introduce AIR on the suction side of the lift pump.
The rack damper can be adjusted:
http://www.peachparts.com/shopforum/diesel-discussion/309971-1985-300d-rack-damper-adjustment.html
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Garage:
2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg
WARNING: this post may contain dangerous free thinking.
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