2017 GMC Denali..

[Shaggy]

someone on another forum mentioned that the assembly that the pedal attaches to is plastic & there is some wiggle room in it. they resolved by putting a wedge or something to take up the movement

eta:
http://www.gm-trucks.com/forums/topic/167606-gas-pedal-flex-solution/

That's not it. The Denali does start up right away, but then there is a delay. I heard they did this because its a heavy machine and they don't want soccer moms to kill the transmission by doing burnouts at stop lights.

 

[Shaggy]

Probably driver error.

I'm sure a blackbear tune would resolve the issue, or maybe something like this: https://www.pedalcommander.com/prod...-v8-420-hp-2015-throttle-response-controller/

Funny Boy! I would like to see if BB can do something with it.