I have Apr Stage 1, BSH pcv fix, and a Forge dv.. Ive been stage 1 for about 4 months now, and this didnt start till about 2 months ago.. Almost every time i floor it in 4th,(sometimes in 3rd too, but not always), and 5th it will hold 15 psi up until about 4800 rpm, but then dives down to 8-9...