ttyson

Hey guys my 99 Z28 makes a really obnoxious sound when i let off the gas. It sounds like a marble or metal ***** rolling around in a tin can. It seems to be coming from either #5 or #7, but it is for sure on the driver's side. The funny part is that if I am driving at a constant speed for a while (ie 65 on the interstate) then pull off an exit the sound does not occur again until 3-4 revs/slowdowns.

It's really wierd. No codes or other oddities, just noise. I tried new gas and that didn't do it. Any suggestions?