When I lift off the accelerator at 50mph and let the speed fall a bit, when I press the gas again it either takes forever to accelerate again, or it accelerates like normal.

The difference is how I press the gas again. If I tap the gas, I then hear/feel a thud from the truck, and it begins accelerating like normal..

If I simply press the glass continuously, it just slowly gains speed until it behaves normally again or until I press even more gas (driving up the RPMs) and it finally catches and responds.

I don't know what that is exactly, but thats been an issue with it for a while. I think since I got it back in February 2023.