I have been having boost issues for awhile now. What will happen is at WOT in 3rd, 4th, 5th or 6th gear my boost will spike at around 21psi hold for a little drop to about 7-10psi fluctuate from 7-13 or so a few times and I can feel the power being lost and gained as it fluctuated and then it would shoot into limp mode. The higher the gear the faster it would go into limp mode. Then after about a minute I would have full boost again. My CEL light has not been on for months during this issue. Yesterday, I got on it a little and it happened again in 3rd gear but my CEL light popped on this time of course. I scanned it and this code came on, 8851-Fuel Pressure Regulator Valve (n276) - Lower Limit Exceeded. Iv changed my HPFP, N80, LPFP, and Fuel filter a little under a year ago. Today I changed my N75 sensor and cleaned my DV, still having the issue. I have been away at college so I haven't been able to address the issue till now. Could it be possible that the Fuel Pressure Regulator valve is restricting it? I don't even know where to go from here.
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