can you name this problem? rb25 cuts power. (ive tried and changed many things)

[droptop rb]

So i have another rb25 with cut out problems. ive tried different ecu and mafs that work, new ignitor chip, a few different plug gaps currently at .8, insulated coilpacks, timing 15btdc, still had the problem so did the gm ls coil pack swap and started it up and just tested it. well runs the exact same! tested fuel pressure its 36psi and 45psi with vacuum line off with a walbro 255.

So exactly how the car acts... sometimes drives and pulls good no problem sometimes hesitates really hard and cuts out and loses all power and i coast till all of a sudden like 2k rpm drop later it kicks back in, all other electrical is all on just seems like lost all spark or fuel. i dont have my afr gauge hooked up yet to see air ratios(i have innovate lm1 to log but need to weld in a bung for it on my exhaust)

anyone experiance any thing like this before ill try anything i have a competition in 2 weeks