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Master
1,959 Answers
- Posted on Oct 01, 2011
Re: 1999 alero rpm goes up and down
Could be a number of things causing this:
1. Bad MAF (Mass Air Flow) sensor can cause erratic idling
2. Dirty fuel injectors
3. Dirty or worn spark plugs
4. Bad TPS (Throttle Position Sensor) this controls engine idling speed under all conditions
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