A combination of old, hard hoses and a dirty ICV will do this -- valve closes to slow the car down, then fails to open as the rpms drop, causing a quiet stall -- engine just quits turning, no shaking, etc.

Clean the valve by filling with carb cleaner, covering the holes, and shaking for 15 sec, then dump the solvent, until it stays clear. This will take a while, probably tons of residue in there.

If the idle control hoses are not fairly soft, replace them.

If you get occasional stalls while just driving, replace the fuel pump relay.

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!