loosing boost,surging t high rpms, somebody help!!

[mgnfcnt978]

I have a regular redtop sr jams with walbro and little things here n there with an s15 t28. Running stock boost and everything. Lately car just starting cutting out every time i get on it hard and all the way around 6k it just cuts out. It almost jsut looses all the pressure and goes in the limp mode for a second or to and then when i upshift its totally fine. No idea what can be causing this, I am running fairly stockish setup any ideas what can be causing that

[cotbu]

More information regarding your setup please! what is stock boost? Do you still have the solenoid? So your running 11psi boost on a stock tuned s13 with 370's and an s15 turbo and your mafs is acting funny, but you still push it to 6000rpm.

user error main cause

[boosted KA24DE]

might be you got a boost leak once you get up to certain boost. leak test your system to at least 15psi to start with and make sure you not leaking.