I have the engine in my sig...Trickflow heads/LT4 hot cam/stealth ram intake/30lb SVO injectors. When I get on the gas the car stumbles/backfires/boogs right around 2-2.5K rpm. I scanned it and the O2 voltage crashes to under 100mV and I get spark knock. I am still using MAF. I made a longer hose for the fuel pressure guage and taped it to the window. The pressure went up as I got on it and stayed as the car stumbled. It did vary slightly due to the engine bucking but it went up and did not crash like I thought. So my fuel pump must be fine. But whats causing the stumble? I have the LV8 AE vs delta LV8 scaled by 5 and I have the number of AE pulses at 32? Whats wrong ?????? Help!!