S14 weird problem and need some insight plz!!

[projectblak]

Mods:
Z32 maf
Denso 550cc
Z32 fuel filter
Safc
Fmic
Sr20det fresh rebuild
Wiring specialties engine and tranny harness.

Alright guys had my s14 sr in my s14, ran perfectly with no issues at 12 psi.
My shell turned out to have frame damage, so I bought another clean shell.
New shell had the dash harness mangled, missing alternator fuse feed line, anyways repaired all the wiring and got it working just fine. Car started up right away and drove fine.
1) I developed a miss at idle and while in boost. When in boost car would feel like fuel cut, and my radio would display a error message saying "please check wiring and reset"
2) ordered a safc to maybe solve the problem. Got it tuned professionally but problem persisted.
Changed out the following:
Coil packs
Coil pack harness
4 different sets of spark plugs with diff gaps.
Fuel pressure is right on.
Valve cover was removed and CAS set correctly professionally.
Thought maybe maf was faulty.
Installed z32 maf, and 550cc denso injectors.
Timing is right on, car drives perfectly out of boost, only under load it does this.
After driving it and paid attention it seems like its not fuel cut but the car actually shuts off and kick back on, happens soo fast that u barely notice it.

My question is this:
can this be a wiring issue?
I have a new uncut dash harness, fuel pump harness and body harness to install but was wondering if any other insight and ideas I can look at before taking everything back out again...
Thanks and appreciate any info,
Taj