RPM increase/decrease

2005 TOYOTA COROLLA
44,500 MILES
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34RJC
  • MEMBER
  • 1 POST
When I am stop for a red light, transmission on auto, AC on. The rpm's drops and car vibrates, and then rpm's goes where it suppose to be. Thanks, Rudy
Apr 24, 2018 at 6:16 AM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
The idle air control valve may be acting up. it is located on the throttle body, you can try and clean the valve passage with a throttle body cleaner. you can also read the position steps with a live data scanner, you can watch the idle valve working. also, look for any other problems as well, like a vacuum leak, ignition problem, faulty sparks or ignition leads. any codes set, regarding engine management problems that need attention as well.
Apr 24, 2018 at 5:46 PM
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