Hello,
This could be a problem with your vehicle's Idle Air Control valve (IAC). It is located on the throttle body assembly of your vehicle's engine. It is responsible for allowing air around your vehicle's closed throttle plate at idle. It is controlled by your vehicle's Power-train Control Module (PCM) and when it fails will cause your vehicle to idle erratically. I have included in the diagrams down below a diagram of the IAC's location and testing it's resistance. You will need a use a multi-meter to do this and I have included a link below for you to go to if you are unfamiliar with how to use one.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
Please go through these guides and get back to us with what you are ale to find out.
Thanks,
Alex
2CarPros
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Saturday, May 11th, 2019 AT 2:32 PM