or when letting it roll in D/R. sounds like someone's phone thats on vibrate is going off somewhere in my car. very intermittent, started hearing it yesterday. any idea what it could be? and no it's not someone's phone on vibrate in my car lol

 

Fill up tank with higher octane gas

 

i always use premium. its not a knocking tho. its more of a weird humming/vibration like something else is being echoed or also running. idk its hard to describe

 

Vehicle speed and engine RPM when you hear it?
Possibly a loose heat shield?