Check on FastLane on this site for idle air hoses.

The aux air valve can sometimes be cleaned.

The MAP sensor is on the fender, I think -- long vac line about 1/2" diameter to the rear of the manifold. If the hose is hard, replace it. You will probably have trouble finding a metric one, so if you go the the auto parts store, get one that is fractionally SMALLER -- the slightly larger one will leak.

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!