2012 gmc sierra denali, i have about a thousand miles on it and want to tune it just to make it drive better, seams like maybe trans line pressure is low? feels like its slipping in 2nd and 3rd at low load and lower speed without too much throttle input sometimes. is there a way to log slipping? from what ive read online it seams a tune will fix this, im pretty sure its not really a problem i hate the way this truck shifts and when it shifts, im planning on having the dealer look at it once i figure out whats going on and before i tune it.