OK few things i noticed straight off the bat..
- atmo breathing but still with PCV? bad news.
- untuned stock ecu on a de+T, asking for a meltdown.
- shit spark plugs, get some NGK coppers (BCP6ES-11, and gap down to 0.8mm if still misfiring).
- possible fkd coils if it gets worse over 4500rpm.