A miss cold that vanishes warm is either a bad injector or a bad glowplug. If the glowplug light flashes after you start the car, it is definitely a bad glowplug. If the light never comes on, it is several bad glowplugs. Cheaper and easier than injectors!.

If the glowplugs are all OK, then I suspect you have a worn injector nozzle.

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!