Sounds like you're hitting fuel cut. You get fuel cut at 13 psi. Do you have a boost gauge? Are you using a MBC?
There is 3 hoses hooked to the stock boost control solenoid. The bottom one goes to the intake resonator box before the compressor inlet.IIRC the middle one goes to the wastegate valve controller and the top one goes to the nipple on top of the turbo. hope this helps.