So I chased a misfire at WOT for a long time. I didn't have warranty left so I chased it myself. Coils, plugs, both HP and LP injectors and no change. Did compression tests and all were good. One day I was like why not pull the valve covers and changed the VVT solenoids for S & Gs and haven't had a misfire since. Not saying it's what's wrong with yours but I think it was what was wrong with mine.
Not fun chasing it down but learned so much about my truck in the process.
Not fun chasing it down but learned so much about my truck in the process.