carb idle too low

I just bought a 1990 brougham with a 307 olds engine with a 4 barrell .The car runs well except when its warmed up the idle drops and the car stalls whenever i come to a stop.Any thoughts
suggestions?... snipped-for-privacy@comcast.net
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The idle could be set too low. Have them up it a bit.
Might also need a new air filter; could be starving for air at just the wrong times.
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