Does the fuel distributor air flap move down when you rev the engine? If not, find the vacuum leak (a big one) and fix it. Idle control valve hoses, boot between air flow horn and throttle body, brake booster and line.

Peter

__________________
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!