Smoke and rough running at idle is poopy glow plugs or late timing. If the pressure valve holder seals are leaking, it won't smoke, it will knock horribly and shake like crazy, with poor performance from little or no fuel delivery.

The 603 is a smoker cold -- run the glow plugs 15 sec or so after the lamp goes out to help, but it's gonna smoke stone cold no matter what from poor cold combustion. Should smooth out in a few seconds, although mine will sometimes kick for 20-30 sec near 0 degrees F. No power til the engine starts to warm up either.

If the idle is rough, replace the engine mounts and shocks, they are likely shot and will greatly increase the engine vibration.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!