I have a 2002 wrx with up-pipe, tbe, and a k&n typhoon, I was recently running the xpt stage 2 map but was having the misfire problems, I figured that I may have screwed something up with the reflash but decided to make the jump to the cobb ap. The problem is the same, whenever the car has been running for a while and I put a load on the engine while in 4th or 5th gear my car misfires. Can somebody tell me what my problem may be, when the engine is cold it runs great?