My notch top sr wont rev passed 2k!! help!

[s14j]

okay guys need some help here im completely stumped on my sr. i posted on the small question but hardly got any responces.

this is a zenki notch top wc ecu and )both f00-f01 mafs have been used)
my cars been great after the rebuild until last week.

my idle is fine but the car cuts up under revving. cold it will rev but miss fire and backfire up around the 5-6krpm.
complete operating temp at W.O.T. is will revv to 2k-2500k and bounce there like if it has a limiter.

i have changed mafs and same problem. both maf test good resistance of 5 ohms i believe that is correct. iv check wiring as well but it is a new harness from wiring specialties and the car was running prior.

TPS has been changed to a new one

my CTS has been borrowed from my brothers red top which was working and still the issue is there (also the o2 sensor has been chnaged same thing)

all boost leaks and piping as sealed. its a stock s14smic

i checked spark and its there i haven't checked resistance on my CAS because i really cant find info on it. haven't checked my knock sensor.

im assuming with the 2k revv limit that the ecu is in limp mode? i cant seem to figure out whats going on i feel like giving up the cars been having so many issues here hand there i just want it running again. any one delt with something close to this problem?

please fellow Zilvia members help me out!