This could be a problem with your vehicle's Idle Air Control (IAC) valve.This valve let's air bypass your closed throttle plate at idle to keep your vehicle's engine idling.It is mounted on the rear of the engine on the side of the throttle body. In the diagrams down below I have included a diagram with the IAC location, as well as factory component tests to make sure the IAC is failing. The phrase KOEO stands for Key On Engine Off and you will need to use a Digital Multi-meter (DMM) to do these tests, so here is a link below for you to go to explaining how to use one, if needed:
Please go through these guides and report back with what you find out.
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Friday, September 6th, 2019 AT 6:42 AM