Thread: GTP random misfire/hesitation

my car has the same prob right now..
I installed the headers & when i put some load on it will start to misfire
i cracked the little tube on the evap purge can. & i thought it would part of that if not completly the reason for the misfires & REALLY REALLY SUCKY MPG i replaced the evap can. & it help a little, mpg wise.. but for the misfires, well theyre still there i checked if we put the wires incorrectly but nop theyre in the correct place..
kinda sucks cuz i was really happy once the headers were on but now this..

I ALSO HAVE THE "SERVICE ENGINE SOON" ON... i still have a cat & the o2 sensors, i just extended the wire so it would reach & it did but after like a day or so of use of the car since its my DD, the SES turned on :/