NEEDING HELP 13 GMC 5.3

[kheao03]

I HAVE A 2013 GMC SIERRA 5.3, I HAVE THE INTUNE AND IS PROGRAMMED RIGHT NOW AT 87 OCTANE AND FIRM SHIFT, IT SEEMS TO BE THAT THE TRUCK DOESNT HAVE ALOT OF POWER LIKE IT SUPPOSE TO I GUESS, I ALSO TRIED THE DIABLO 93 TUNE. THE TRANS SEEMS TO SHIFT FAST AT LOW SPEEDS AND IT SEEMS LIKE IT TAKES ABOUT A SEC OR SO SHIFTING AT FULL THROTTLE, BUT WHEN IT DOES SHIFT, ITDS HARD. IM JUST NEEDING SOME HELP ON ADJUSTING THE PARAMETERS IF YOU CAN ADJUST THEM OR WHATEVER TO GIVE MY TRUCK THE FULL POTENTIAL. THANKS TO WHOEVER CAN HELP.