I had a misfire in cyl 4 and did the following to resolve it:
1. Clean MAF
2. Moved coil pack 4th to 3.
3. Switched to better gas - running an oc booster to spike the bad gas up
4. Ran redline injector cleaner
5. Replaced PCV
Misfire has gone away completely.
I have a tone of blow by at stage 2 and need a catch can. Check your oil in the TMIC. If you have, this will cause lower oc burns due to the inclusion of oil.