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After going through a Lemon Law case, and loosing, because of hesitation in my 2018 GMC Z71 1500, I learned a lot about what's going on. The BOTTOM-LINE - GM is intentionally detuning our trucks. This is undisputable. During the deposition phase, GM acknowledge they are intentionally detuning the trucks in an attempt to save approximately 1-2 mpg. What was I experiencing: Hesitation when in Active Fuel Management mode. Hesitation when lightly pushing on the gas When pressing on the accelerator peddle the power was delayed getting to the rear wheels When getting on the gas pedal immediately after braking, there is a HUGE delay When lightly pressing on the accelerator pedal, the RPMs actually go DOWN (WTF???) When going 30 mph the vehicle is already in 6th gear and lugging. This one detuning trick, turns your 350hp vehicle into a Subaru. Extremely slow transmission control to shift into a lower gear. Extremely fast transmission control to shift into a higher gear. So, after loosing, what did I do to fix these issues? I paid to have the truck re-tuned. I waited to almost 60,000 miles when the warranty expired. I am kicking myself for not doing it sooner. I am not affiliated with this guy at all, but I will tell you LEW at diablewtune.com fixed 95% of the issues and I can FINALLY enjoy the drivability of the vehicle, as I would have designed it. It actually pulls hard from a dead stop. I can actually smoke the tires if I wanted. YES, performance over economy in every situation ... finally! So for all you potential buyers out there, don't waste your time. Drive it off the lot and don't hesitate like the truck hesitates and give your vehicle a performance tune immediately.