Hi,
It could be several things. For example, there could be a belt-driven accessory that has a bad bearing. On the other hand, it could be related to the engine or transmission.
If possible, record the sound and upload it for me to hear. Also, here is a link that reviews engine sounds. Take a look through it and see if anything mirrors what you are experiencing.
https://www.2carpros.com/articles/engine-noises
Let me know if this helps or if you have other questions.
Take care and God Bless,
Joe
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Thursday, March 11th, 2021 AT 7:56 PM