Hello again.
This could be a problem with your Idle Air Control Motor[IAC]. In the diagrams down below I have included the location, testing and adjustment instructions for your vehicle's IAC. The testing calls for the use of an oscilloscope, so I'm not sure how helpful it will be to you, but I sent it anyway. Please go through these guides and get back to us with what you are able to find out. We can go from there if necessary.
Thanks,
Alex
2CarPros
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Friday, March 27th, 2020 AT 8:37 PM