Around 5.5k to 6k my secondary starts to sputter. the pattern goes from 10-6 and stays at 5-6, So I'm wondering if this could be solenoid related. And sometimes it just doesn't accelerate at all, and goes down to 0 psi. But eventually, if you hold down the gas for a while , it works itself out and starts accelerating again-but still stays at 5 psi. any ideas? Thanks in advance.

P.S. only after market performance support I'm running is full exhaust, and an aftermarket ABV.

 

Check this thread:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/strange-boost-issue-733272/

Perform the KOKO test and see what results you get.