is it the throw out bearing?
 

after i installed my intake now when the car is runing and the clutch is out there is a rattleing type sound..a buddy of mine said it might be the throw out bearing

when i installed my intake i had a gasket slide and my engine water loked..he said that might of done something to the throw out bearing..is this correct?

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'91 GT,91K,T-5,air silencer removed,HD clutch,K&N air filter,Mac long tubes,Cat-back,off road H,FMS 9mm wires,180 thermostat,Competition gauges,C&L 76mm MAF,Accufab 70mm TB,TFS street heat intake

Waiting install:Nothing

Future Mods:3.73's,Pro 5.0,TFS heads,TFS stage 1 cam,lakewood struts/shocks,nitto DR's
ICQ#35670781
http://www.mustangworld.com/mpics/mwl1.gif

A throwout bearing is pretty far away from the intake. I can't even picture what your friend is trying to suggest. Try putting your car up on jackstands and start it. Look around for things that could rattle. Maybe use a mechanics stethescope to see if you can pinpoint the sound.

Have you adjusted your clutch recently? Maybe a little too loose so that the release fork is rattling?

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351W 89 Mustang GT Convertible

Does the noise change when engaging the clutch pedal? I had a throwout bearing go bad and could tell just by working the clutch and the pitch of the sound would change.