About two weeks ago my bike started misfiring while driving it around town. It would only misfire for a minute or so then it would lunge forward like I hit a nos button or something and have full power. I thought maybe it was bad gas or something. I ran all the gas out and filled it with fresh 93,(I know the warrior doesnt require 93), so I filled it with 93 and it went away, it hasnt done it in the last two weeks. I have only rode the bike twice in the past two weeks. THe mods I have are the COIL RELOCATION PLATE, VBAK, PCIII, and v/h bigshots exhaust. So it hasnt done itthe two times I rode in the past twqo weeksuntil yesterday. I rode about 90miles and then it started misfiring. I shut the bike downwhen I got it home, let it sitfor an hour, started the bike and it was still misfiring. I put my hand over the exhaust and the front cylinder exhaust was warm but the back was not. I belive the problem is in the back cylinder. I revved it up a few times and it finnally stopped missfiring and runningnormal. It isnt consistently missfiring, it just comes and goes. Kind of scary if your in a corner. WHat could have caused this? Why would it only missfire sometimes.? I know it either has to be spark,fuel,or compression. Its not consistent so it cant be compression, right? SO thay only leaves spark and fuel. My bike is an 04, it has 13,000 miles on it. WHere should I start looking. IS there a way to test the injectors or do I have to take it some where?