Check for a broken rotor or rotor carrier, they are common and happen suddenly.

Do the fuel pumps run when you crank? Right rear, under the rear seat, check from under the car.

Could also be a defective crank position sensor, in which case you will not have spark.

And look for a split boot between the air flow meter horn and the throttle body or a broken or badly split idle control valve hose (under the air filter housing).

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!