Have a 99 Alero, 4cy with 144k on it. The car has a tendancy to stall at idle, usually when trying to accelerate after making a stop. Has no issues at highway speed and the stalling seems to start after thecar reaches operating temp. The parts I have replace so far are IAC valve, fuel filter, crankshaft position sensor, ignition module, new plugs/boots. Also has a new batt and alternator. I''ve run out of ideas here. Any input would be appreciated.

Problem fixed. Turned out to be the hose connecting to the MAP sensor was dry rotted and cracked causing a vacuum leak.

Glad to hear you got it fixed.