Hello all. I'm trying to figure out what I'm doing wrong with a GM TBI system I built. 747 ECM, TunerCat $42. Seems like anything above around 85 Kpa (about 4-5"Hg and lower) under load I'm running out of fuel. I have AFR vs MAP to zero in that range, have gone down to 13/1 AFR vs temp through whole range and max open loop AFR to 13. Also I have it always running in O.L. so it never gets to C.L.
Once the MAP gets below that the engine takes off. Running 12.5 PSI pressure. Any ideas where I should be looking? Thanks.