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

Sometimes in Park or idling at a stoplight my car revs up and then down without my touching the gas, what's going on?

by in Shelby, NC on August 10, 2009
2 answers 2 comments
ANSWER by on August 11, 2009
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?
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COMMENT by on February 06, 2011
Yes
COMMENT by on March 28, 2011
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
ANSWER by on March 28, 2011
Get the diagnostic codes in the engine computer checked and diagnosed.