Im having a problem with my transmission shifting... I shortend the shifts and started adding line pressure after installing my stall and new motor... I got a base tune from the repository and started adjusting from there the problem im having is at wide open throttle it wont shift at all and while driving it wont stay in lock up and as soon as you start accelerating it just starts down shifting and slowing down wont hold a gear... just need some help please
BLACK GMC TUNE 4.hpt