Hello,
A high idle or a "searching" idle can be the Idle Air Control[IAC] valve, OR, the wires associated to it. Another thing that causes this condition is an intake or vacuum leak. Here is a link below explaining what a vacuum leak is and how to find and fix it below:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
If the problem isn't an intake or vacuum leak, and it is still the IAC valve, then the problem is going to be, more than likely, in the wiring going to the IAC valve. In the diagrams down below I have included a wiring diagram of the IAC valve, and guides with how to find opens, short to grounds, shorts to power, intermittent and connector problems, and how to find unwanted resistance in an automotive electrical circuit using the preferred method, voltage drop. You will need to use a Digital Multi-meter to do these tests, so here is a link below explaining how to use one, if needed:
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Please go through these guides and get back to us with what you find out.
Thanks,
Alex
2CarPros
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Tuesday, November 12th, 2019 AT 5:10 PM