How To Reset Accelerator Pedal
 

Possible Drive by wire adjustment???? My 06 seems to be fine. If you try it please report your results here.Here are the steps .....
1. Turn on truck without starting the engine
2. Wait til the dash lights stabilize (some of them will turn off)
3. Step on the gas pedal in one smooth and steady motion
4. Once gas pedal hits the bottom, let go
5. Turn off car and wait 4-5 seconds
6. Turn engine on
7. Drive
8. Repeat 1-6 if it doesn't work the first time
I would only do this if your truck is stock and experiencing a hesitation with the accelerator pedal.

Resource: FTE