im rad
when my stock turbo on the 32 was on the way out i had the same thing - itd boost and then nothing at all
i found it slowly got worse the long i drove - like once the car was warm and i started hitting boost it was ok, but if i smashed it/clutch kicked it - after that shot of boost it'd go to shit for a bit
im sorry to hear your misfortune bro - im happy to help where i can