I have an '84 300SD, 110K mi.
The idle is a bit off, and consequently the thing runs rough. If I barely touch the gas pedal it is fine. Guessing by the almost lack of movement by the tach were talking 50 to 100rpm. My local repair shop said there is no "easy" idle adjust - it is in the injector pump. Am I being hosed, or is there a fairly easy means of adjusting the idle?