Hey everyone i am new to hp tuners new to fuel injection in general always been a carb guy and am trying to crossover. i am having a problem with a 5.3ls swap that is hitting but backfires through the exhaust and doesn't actually fire.i am running the pcm in speed density mode with a 3 bar map hoping to turbo it after everything is working engine wise. i assume it is a calibration issue between the crank sensor and the cam sensor but i am not sure how to fix it. Any advice would be greatly appreciated.