Check for hard hoses on the idle control valve, and for any other vacuum line leaks -- I'm guessing you also have some throttle lag on takeoff, hot or cold.

Also check the idle control valve for proper funtion, it if sticks you may have trouble.

I'd also clean the venturi on the fuel distributor and check for smooth movement of the air metering flap hot -- if the seals on the plunger are bad, or the plunger is scored, it could hang at idle, causing funny air fuel mix.

You could also have a bad throttle position senor pot. This will cause the same problems as a bad accelerator pump -- no reponse on throttle opening for a second or two.

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!