Archangels

I was driving home last night on the highway and decided to boost in 4th, as the RPM's raised around 6500rpm it felt as if i hit redline, the engine cut out and i noticed the AFR on my wideband go a little leaner, around 12's....

i tried it once more and it did the same thing just at a slightly lower RPM, around 6000rpm, also on my power FC i noticed the knock reading was 5points higher then it normally would be, i cant understand what could or may cause this, idea's?...

the car drives and boosts perfectly fine in the lower 3 gears but has this hessitation in the upper two, when i let off when the hessitation occured i noticed the boost at 14.7psi, i'm running a BNR3 on a power FC with a ported engine....

i'm stumped, any idea's?...