well,,i just took a white knuckle ride on some cold snowy roads !! its pretty much does the same thing. i was logging commanded afr, and on the first stab, up to 90 mph, no pe, just 14.68 all the way. i slowed down,stabbed it again, @ 85-90 mph, it just started to go into pe. third try, pretty much went into pe with throttle command. if your just driving this truck down the road,and stab it,,no pe,,you have to beat up on it alittle,,then it goes in,, you can feel the differance by the seat of your pants when pe works. the stock tune works the same way. this is the only truck ive had problems with, it also might be the only 06 half ton that ive noticed this on.