Ok so to start with I have a 06 wrx vf39ed with a AP, sti tmic, full catless TBE, a new clutch and a light wight flywheel (at least 2500 miles on the clutch and flywheel never had any problems with them). Two days ago I did a pull from a 4th gear roll, ran the gear and when I shifted into 5th I got a check engine light. AP read it as misfire cylinder one. I have new NKGS less than a 1000 miles old. So I got to the house pulled the plug and it was a little black but not to bad. Cleaned it regaped to .030 and stuck it back in light flips on agine. So far we have swapped the plugs and coil packs from 3 to 1 and nothing has changed. Did a compesssion check came back as 155. Cleaned the MAF sensor. Nothing has helped. We were wanting to swap the fuel injectors but can not get a replacement for at least three days and dont want to risk ruining one of the o rings on the injectors and I am currently at my brothers house and have a six hunderd mile drive home on sat. morning. One thing I have noticed is in the monitoring section on the AP there is one called cylinder roughness, there is one for all four cylinders, only cylinder one is reading anything and its only reading when I am at idle or on the gas, it stops the count when i am decelerating. Does anyone know what this means? I called cobb and the guy I talked to really wasent much help. " Cam timing. Check cam timing per the service manual.8. Excessive PCV blow by. PVC gases will effectively lower the octane content of gasoline/petrol. " was all on donkeys misfire sticky page and are about the only two I have not checked along with the injectors. Has anyone had any experancie changing the injector? Do I need to worry about the O rings and being able to reuse them? I also need to research the pcv thing any one no how hard it is to change that? Also in on the cam timing he say to refer to the service manual, anyone know how to get ahold of one of thoughs easily. Any ideas or thoughs would be great thanks.