Craig:

Techron fuel injector cleaner is sold in many auto parts stores, even the low-rent chain ones.

You almost certainly have bad gas in there, and it will take a while to get the plugs clear once they get sooty. If they are Bosch, get the fuel system clean by running a fresh tank though with Techron in it, then replace the plugs. They recover from carbon fouling VERY slowly (except the Platinums).

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!