GEO Prizm 1997 - rattling when clutch not depressed.
	
	
		GEO Prizm 1997 - rattling when clutch not depressed.  In other words, the noise seems to come from below the motor / engine.  It is mostly apparent when, while idling, I do not have the clutch depressed.  When I press down and hold the clutch in place the noise (from the perspective of listening while my door is open and I am sitting behind the wheel) - the noise is gone.
Any ideas out there?  :confused: 
By the way a "rookie" mechanic ;)  at a Tire shop here in Florida thought that the source was a "seal?" or bushing that is in between the exhasut pipe joints.  Stating that over time and aging... those go bad, break away and create the noises.
If that is the case, would I be best off replacing the entire exhaust system?  
BTW I have the original system in place with over 129K miles on that engine!
Thanking you in advance for your help!
T