This could be a couple things, but the issue is the air fuel ratio is not correct. This means we need to figure out why it is too rich or lean.
We can monitor the short-term fuel trims to figure this out and I will attach a chart below that will help with this.
However, the most likely cause of this is the idle air control is not allowing enough air to come in when the throttle is closed.
https://www.2carpros.com/articles/idle-air-control-valve-service
https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac
Please see the info below on this and let's start with this and let us know what you find.
Let me know what questions you have, and we can go from there.
Thanks
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Friday, January 7th, 2022 AT 2:23 PM