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Car's rpm keeps dropping below 1k an then climbs up to 1.5k and the process repeats and repeats. It happens when i turn on the AC but when i turn the AC off it seems to be more stable. Some people say that this is caused by a bad throttle body. Is this true or maybe its other causes?

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    idle hunting is usually due to a very dirty throttle body, it needs a good cleaning. – Moab Aug 8 '18 at 14:25
  • @Moab maybe you should post this as an answer? – James Jenkins Aug 8 '18 at 17:22
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Idle hunting is usually due to a very dirty throttle body, it needs a good cleaning.

Depending on make and model you may have to perform idle relearn after cleaning.

  • Also check fuel pressure. And tiny splits in a vacuum hose can open and close. – John Canon Dec 26 '18 at 6:19

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