2001 Nissan Sunny Engine Revs Idle Shuts Down Sometimes Waiting Stoplight

2001 NISSAN SUNNY
307,000 MILES
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The engine revs when idle and shuts down sometimes when am waiting at a stoplight. the diagnostic test done is not showing a problem as each time the car revs the communication cuts off from the cars computer. I have changed the air flow control valve also and the problem still persist. The cars computer was also checked and its working fine.
Jan 29, 2013 at 10:20 AM
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KHLOW2008
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Check the IAC, clean it and retest.
Jan 29, 2013 at 12:45 PM
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