you have to be 100% sure the grounds at the coil/module are 100% GOOD!!!!! a greasy oily connection causes all kinds of shit. make sure one of them hasnt come out of the connector and is hanging down. also the small braided ground should be hooked up too. it grounds the motor mounts at the K-member and helps ground the body. Also the ground near the battery on that single post decides to get corroded at times. those are the only grounds that matter for the PCM to function properly. if they all look clean and are tight ohm them out at the PCM red and blue connectors. if you need i can get you a pinnout for your car.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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