Hello,
Are you getting any trouble codes? Is the check engine light illuminated?
One of the common reason for high idle is a faulty idle air control valve (IAC). Overtime dirt and debris can buildup inside the valve and cause it to stuck open, allowing more air than it supposed to. Which leads to a high idle.
The IAC can be serviced by cleaning it. Many times that improves the idle quality.
Take a look at this helpful guide:
https://www.2carpros.com/articles/engine-idles-too-high
I have attached diagrams for your reference.
Please let me know if you have any questions.
Thank you.
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Tuesday, November 30th, 2021 AT 2:39 PM