2020 SEL Atlas Crosssport 4cyl

Driving in the rain yesterday, had some wheel slip I think, while I was hard accelerating to get into traffic. Revs went up pretty high, and afterwards I began to notice what sounds like a loud cat purr sound coming from the motor. I got home and parked, when I rev, the sound tracks the revs, when I let off, it stops until the idle settles and then it begins again. Opened the hood and it seems to be coming directly from the engine. Let it sit, came out later and on a fresh start, didn’t hear it again.

Today, no sound until it warmed up slightly, and now it’s back. It doesn’t seem to affect performance, no lights, etc.

This stand out for anyone? Trying to determine what to do. I am somewhat mechanically inclined, so would love to avoid a trip to the shop. Any advice would be appreciated!