2002 Oldsmobile Silhouette rattling noise
 

I've got a 2002 Oldsmobile Silhouette that makes a loud rattling noise at idle. The noise seems to be coming from under the hood. The noise goes away once you start rolling. Has anyone else had this problem? Thanks.

I took the belt off to rule out all those parts, still had the rattle. Wonder if it could still be the harmonic balancer.