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Anonymous Posted on Oct 01, 2011

1999 alero rpm goes up and down - 1999 Oldsmobile Alero

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  • Master 1,959 Answers
  • Posted on Oct 01, 2011
Anonymous
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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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