I have a 98 Saturn sw2 with a recent problem. Two times now it has stalled while idling and when it doesn't stall it floats near 500 rpms (Usually 750 - 950). The first time, it would start and just drop down to nothing, the next was coming to a stop. These times have been remedied by using the gas pedal to regulate the rpms and keep them in the normal range. It may be worth noting that the first time it happened was after filling up from near empty (emptier than I usually let it) and there was a bad storm the night before. Is it a sensor, some blockage or did I get bad gas?
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I caved (mainly since it is dangerous to keep driving it like it is) and brought it to my local mechanic. He says it is the Idle Air Intake control. I am not going to accept this answer until I can do a test drive.
EDIT: Well my mechanic was right on the nose. The replacement worked like a charm.
Long shot, but do you have a voltmeter? Check the voltage at the battery when the car is running, might be a faulty alternator.