if you have an ckp code its still a 1996 ecm. 1995 and back didnt have them. i still say take care of the pending codes with the opti and move onto the next thing. and wen your done have a madz tune done. probably the cheapest way to go as far as tune. and they do a Way better job at mail order then PCM FOR LESS!!
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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