O2 volts are a funny thing. narrow bands suck. when they are to rich I.E. wet fuel/soot on them they read lean(low volts). and the pcm picks it up as LEAN and adds more fuel compounding the problem. bet you have a K&N filter? cleaned the MAF?
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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