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unstable engine idle

Engine

Model: 944S2, Year:1990, Mileage:125000, Type of use:Street use only
Bill, my 944 has been exibiting a very unstable engine idle speed. The issues seems to surface only once the engine is warmed up. I find that the entire problem is an off and on issue, but seems to be gradually getting worse. The idle speed fluctutes between 1,000 rpm or so and about 400 rpm, and sometimes just dies at the stop light. Is there a common problem here? (like the idle control valve) Is there an easy way to test this issue to confirm what's wrong? Harley Haag, still living on Governor Dr in University City.

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