Chuck:

Bingo!

I suspect the idle mixture was set with a vac leak, with the result that you are now running rich with the leak fixed. Double check everything for leaks, including the idle control valve hoses if you have idle speed control (I think you do). Also check the condition of the idle control valve, they get dirty and cause rough idle and/or idle speed hunting when the valve overcorrects, sticks, comes free, and then sticks again.

Make sure all the accessory vac systems hold vac, too -- leaking door lock or climate control systems can cause funny idle, too. Ditto for EGR and tranny control stuff. I replaced ALL the connectors in the engine compartment on the 300TE -- eliminated most of the stalling problem (sticky idle control valve) and the serious throttle lag. Also replaced the idle control valve hoses -- big pain on the six, but it runs better!

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!