Hi,
By chance, have you had the computer scanned? I ask because there a few things that can cause the idle speed to increase. For example, the A/C system, Power Steering system, or anything that places a load on the engine at idle.
Also, engine vacuum leaks can also cause idle-related issues. How high does it idle when this happens and is there anything that you can think of that causes it or changes it?
Here is a link that explains how to test for a vacuum leak. Try this and let me know if you find anything.
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Take care,
Joe
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Tuesday, December 21st, 2021 AT 6:51 PM