cant go by sound. the sound could be a multitude of different things wrong with the car. The Map sensor for one can cause a stumble at idle as well as the maf. stuck egr valve or leaking block off plates? are a few i can think of. best way to tell without pulling it all apart is have it checked at a dyno. Preferably Dons shop to make sure its not too lean or rich and see what power it puts down. if it makes over 250rwhp its cammed!!! hahaha
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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