Have an 02 boosted Silverado that is either losing Fuel pw, or Mani pressure. Hard to tell egg or chicken. I've tried a multitude of modified tables to see if I can find what is causing it. Happens everytime at around 3800rpm to 4000rpm. It is on a 2 bar Sd conversion. Early Ecm leaves little channels to tell me what is getting triggered to cut fuel, or if pressure is dropping which is causing fuel pw to decrease? Any input would be appreciated.