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Q: In park or idle it sometimes revs and then idles low on 1999 Nissan Altima

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Sometimes in Park or idling at a stoplight my car revs up and then down without my touching the gas, what's going on?
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There are several sensors that can cause this, or a vacuum leak, or an issue with the idle controls. Is the check engine light on?
All the time in Park or idling at a stoplight my car revs up and then down without my touching the gas, what's going on? And the check engine light is on

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