Help please. I have gone to 3 tuners. So far, no one can fix this issue. I am running full SD. (I have a separate vacuum gauge in my pillar). My biggest issue is when I am gently accelerating, as soon as I am at 0 vacuum, the car starts to cough, sputter, and jerk. However to explain it.... But, as soon as I floor the gas pedal and pass that point, the car runs decent. Minus a few coughs in the top RPMs. The last tuner said my new 2.5 bar MAP is junk, get a new GM MAP. Unfortunately, I had already ordered another 3 bar MAP from EFI Source. They give the linear and offset numbers on their site for HPTuners. So, I just installed it in my car and it made no difference from my old 2.5bar MAP. Can someone help please. Is it ignition timing issues or what? Maybe there are other programming issues or improper tables filled too. Any help would be greatly appreciated.
And yes, it is now running pig rich because of the new MAP....
Stock 05 Cadillac P59 ECM. LS6 stroked, Pro Charger F1a. Maybe 15 pounds of boost. All forged. 230 AFR Mongoose heads. Stage 4 cam. 90mm throttle. 92 Fast intake. 9.5:1 pistons. 3 bar MAP. 800cc Siemans Deka injectors.