Nissan24zero

Hi guys, new member to the page.
So my rb25 has been acting funny lately, whenever I go into higher RPMs, it'll start to sputter and I'm losing a lot of power.
It typically happens around 5-6k Rpm and about 8-10 psi.
It's a completely stock motor except LQ9 coilpacks and a pro series harness.
I've checked my plugs, they're gapped to .8mm, checked my MAF, and changed out my fuel filter.
Still have the same problem.
I personally think it's a bad coil, or multiple coils, and im in the process of verifying that, just need to make a bracket.

Also, when I push the clutch to the floor, it goes really low in the RPMs and sometimes shuts off.
The shutting off issue just started happening today.

Any help would be appreciated thanks in advance!