If it stalls while braking hard ONLY, it's the idle control valve and/or bad idle control valve hoses. If it stalls at any other time, it's most likely the fuel pump relay, unless it ONLY stalls when suddenly opening the throttle -- in that case suspect the airflow meter pot.

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!