Does your car have an EGR? If so, it's stuck open.

To re-set the fuel mix you are either going to have to get the engine running or jumper the fuel pump relay to get fuel pressure, then carefully loosen the injector lines on the fuel distributor and turn the idle mix screw slowy rich until fuel starts to bleed out. This will get you into running range, you can then adjust it with the duty cycle (70 is too lean, I think). Should be 40-50% or what it runs at 2500 rpm, whichever works better.

It's also time to replace idle control valve hoses, and any other rubber vac lines that aren't in good condition. Also, check the connection for the brake booster, it can work loose and give you fits.

Terrible blowby will also cause this, but you would have to have an engine in really rotten condition for that to happen (or a blown head gasket -- worth a check).

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!