I've been having misfire issues too. After spending a couple days researching, I also found this thread, he bought a car with misfire issues, and it turned out to be an incorrectly installed head gasket. I just thought I'd post this here so you could add it to your list if you like.
http://forums.nasioc.com/forums/show...hlight=misfire
I'm going to a buddie's house this afternoon to try and fix the problem, I'll be taking a PCV vlave, fuel filter, and some MAF cleaner. Hopefully that will get my issue fixed. Thanks for starting this thread. The only complaint I have about it is that it isn't stuck to the top so that it's much easier to find. Come on mods, get r' done. You know it's the only way to stop almost every person with a misfire from starting another thread about their problem.