Vin:

you need to get a digital VOM that does duty cycle and test the fuel control system. Described many times on this forum, but the basics are that with the red lead connected to pin #3 of the round diagnostics connector and the black lead in #2 (or another ground), the duty cycle reading shoudl be around 50% and fluctuating on a warm engine. Should to low (I believe, check the DIY engine controls post) as the throttle is opened and drop back to 50% or so quickly. Should go way high on coast (fuel shutoff), returning to 50% when idle is achieved.

Check the idle switch on the linkage -- if it is failed, you would be in idle condition all the time, this will goof up the running mixture. So will a bad engine temp sensor.

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!