More than likely your balancer is the issue. This is the pulley that is connected to the crank shaft.
Here are some guides that will with this:
https://www.2carpros.com/articles/how-a-harmonic-balancer-works
https://www.2carpros.com/articles/replace-serpentine-belt
I am attaching the info below to help replace this which is what needs to happen before this breaks or it can damage the engine and then you have a much larger repair.
Please run through this info and let us know what you find. Thanks
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Monday, November 29th, 2021 AT 8:01 AM