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what kind of sound does it make when it misfires?....
I have a 2001 GTP it misfires on idle 2-3 times # 4 cyclinder the reason i no this bec i have a ls1m scanner.. i dont hear anthing...
I agree did it happen after you chaneged the plugs?
If so replace them again with some NGK or something
did this start before or after you changed your plugs?