Hello,
It sounds to me like your Idle Air Control Valve [IAC] has failed and needs to be replaced. Just to make sure though I have included the diagnostics test guide from the vehicle manufacturer in the diagrams down below. You will need to use a Digital Multi-meter [DMM] to do these tests, so here is a link below on 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 are able to find out. If the IAC valve is bad here is a link below on how to change it:
https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac
Thanks,
Alex
2CarPros
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Wednesday, November 6th, 2019 AT 5:27 PM