Low boost.
 

Hi all.
If I nail my 95 wrx wagon for about 10 mins the boost drops off to 7psi actuator pressure but if i switch the ignition off then back on again its fine for another ten mins. Ive checked the fault codes and there is none. It still revs to the red line when on low boost so its not going into full limp mode.

Anybody able to point me in the right direction.
Thanks.

:cry::