I returned my truck to stock just to see wgat it would drive like. Well it idles fine but when you take off it acts like its slowly shifts into 2nd and 3rd and clunks hard and if you give it a wot run it throws it into towhaul and blinks on and off and stays into 3rd or 4th. Now what the heck is the deal with all this lol. If I tune with my innovative tune its fine and shifts great. Does anyone have a clue.