Hello,
I have a 2018 GMC Denali 6.2 that is a month and a half old, 2000 miles. Since new it pulsates or flutters under mid take off. It seems to me a fuel management or torque converter program issue??? It just does not have a smooth pull as other vehicles do. The dealer has no answers since it does not throw a code but it is obviously there. Runs the same on 91 and/or 87 octane, literally no difference. Love the truck other than the acceleration issue, Any Suggestions Please?