Intermitant stalling can also be a fuel pump relay -- you don't notice it when driving because you only get a very short loss of power before the fuel pressure comes back up, but at idle the engine stalls.
Most likely a big vac leak and a bad OVP relay.
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!