I have a 02 wrx that is misfiring like crazy but when I hook it up to the comp it has no misfire codes. Anyone ever happen to have gone through this? I would hate to have to replace each coil pack just to see if thats even the problem. Plug are all brand new. Mass air flow seams to be goood. This started to happen a week after replacing the rare tumble sensor so I checked the rubber tube around the turbo for leaks, can't seem to find any. Any thought would help.