Intermittent high/low rpm's

216,000 MILES • 4.0L • 4WD • AUTOMATIC
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ITSBROKEN
  • MEMBER
  • 1 POST
Car intermittent stalls at idle. Intermittent power surge. Intermittent high rpm's. Increased fuel consumption.
Jan 31, 2020 at 11:19 PM
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SCGRANTURISMO
  • ✓Experienced Mechanic
  • 4,897 POSTS
Hello,

This sounds like you could have a vacuum leak. A vacuum leak will cause a high idle or a "searching" idle when the engine will rev up and down like it's surging. Here is a guide below explaining how to find a vacuum leak in your vehicle:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please go through this guide and get back to us with what you find out.

Thanks,
Alex
2Carpros
Feb 1, 2020 at 1:23 AM
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