LS1 issues - input needed

[fastmuther]

i just put headers on my 02 ls1 firebird. and its missfiring bad now. could it be cause the rear o2 sensors arent hooked up and i have no o2 eleminators on them? i took it to advanced auto to see what the comp had to say but all it said was rear o2 sensors and cylinder 7 missfire but the guy said it was probably tryin to fix itself

[NviouSS]

the misfire could be because the plug wire isn't on all the way.

[03slowZ06]

No the rear o2 is not going to cause a miss. Figure out why #7 is missing. Then apply the #7 fix to every cylinder.

[adamblake31]

i had the same problem it turned out the spark plug boot just wasnt down on the plug all the way easy fix. you can also check by taking out the plug and see if you or the person who installed your headers didnt hit the plug and crack it or maybe the wire is just bad. i would also have your pcm tuned that would help with having no 02 sensors