i have a 98 firebird with a big misfire problem ive changed the plugs,wires,all 3 coils put a high flow manaflow cat on,oxy sensors and it still runs like dog poo the ses light flashes when it runs bad mostly when i run the acim about to drive it off the bay bridge some help me on this!

 

well i guess no one has a clue ran the computer and cylinder three has the misfire and its a brand new plug do u think that cylinder might have meesed up when i had a 75shot of n2o?

 

what was the code for the misfire? was it p0300 or p0303?