Loss of idle speed control is usually a combination of leaking idle control valve hoses, dirty idle control valve (sticking) and/or a bad fuel pump relay or fuel pump.

If the stalling is ONLY when making fairly firm stops from speed, the idle control valve is sticking, remove it, fill it will carb spray, cover the nipples, shake for 15 sec or so, and dump the carb cleaner spray. Repeat until the stuff comes out clear (it will take a while).

If the idle control valve hoses are anthing less than perfectly pliable, replace them -- most likely they are rock hard and loose, allowing the dirt in that causes the idle control vavle to stick, and causing a serious vacuum leak as well.

If it bucks or stalls while driving, the fuel pump relay is bad, or you have a bad fuel pump(s).

Most likely it's bad idle control valve hoses and a sticking idle control vavle.

None of this is difficult except replacing the manifold side hose, it's a pure pain, takes two people usually (one to guide, the other to push).

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!