does it skip at idle? if it stumbles at idle in plug each coil at a time and find out what one does NOT make the skip worse. and thats the one. but more then likely with a random miss code its not a single injector or coil/wir/plug. and id bring it to Don asap. and dont drive it as it could be leaning out and you will hurt something.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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