Very Strange Noise.. HELP!

[markdoddridge]

I have an 04 H2, and the engine is making the worlds strangest noise. Its not a ticking, or a rapping, its like something got loose and is bouncing around inside the engine compartment.

Its only present at idle and slow speeds. Once i speed up it goes away. Also when i rev the engine it doesnt get louder. Its almost like a screw or a bolt fell out and is rattling around somewhere.

If anyone has ever had a quarter get loose inside their dryer, it sounds almost exactly like that, but faster

Anyone had anything similar to this? the check engine light is also on