Hello,
A high or "searching" idle is usually because of an engine vacuum leak. A vacuum link is described as any unmetered air that enters the engine from the Mass Airflow Sensor [MAF] to the engines combustion chambers. This includes the air intake tract, throttle body, intake manifold, vacuum hoses, PCV valves/hoses/ EVAP hoses, and Idle Air Control [IAC] hoses. Here is a link below explaining how to check your vehicle for vacuum leaks more thoroughly below:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Please go through this guide and get back to us with how everything turns out and what you are able to find.
Thanks,
Alex
2CarPros
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Saturday, November 23rd, 2019 AT 1:36 PM