On my 83 300CD (246,000), the car always started up perfectly (even in 15F weather), but it always has had a "miss" or "flutter" when idling cold. I exhanged the injectors, but no improvement. I have also checked for air leaks. ODDLY, this morning, I put the car in drive and the idle was perfect. I put in back in park & the miss/flutter returns. Likewise, in drive, there is no fluttering. What could be causing this? In driving MB diesels for 30 years, I have never experienced this, nor heard anyone mention this. Thanks!

Richard

I also replaced injectors, adjusted valves etc. but it is a lumpy,jumpy idler in park and smooth in drive.
I have not replsced motor mounts but they look ok

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily

What is your idle speed in Drive?

It could not hurt to try an adjustment of the Rack Dampner Screw.

Valve adjustment?

A couple of Members have said that stretching the Spring in their Fuel Injection Pump Pressure Relief/Overflow Valve to the limit that the Manual allows helped.
http://www.peachparts.com/shopforum/showthread.php?t=234609


Mine idles better in Park than in Drive also but I do not feel that it is actually rough.

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84 300D, 82 Volvo 244Gl Diesel