I can get a sound clip if yous would like and you can just i/m me on sean001134 and i'll send it to you, but if it is like a loose rocker arm, i have a 2.8 v6 and i don't think i can take my valve cover off without taking the whole intake manifold off first, what do yas this?

Its like a bolt inside a coffee can then an earthquake hits, yes its that high pitched. its like a ringing only at idle, then past like 2500 it stops