Is it turbo??
I normally can boost to 7.5 psi but the highest i can see now is 4-5 psi... and as i drive at wot it sometimes goes down to 2 psi. i made a boost leak tester and found and sealed up all my boost leaks through my couplers. still low boost!! can a vacuum leak some where in the vacuum system cause me not to boost above 3-4 psi?? any suggestions please!!