The Throttle is "Drive By Wire" and adapts to your particular driving
style. Do a Throttle body reset.
Not sure if you have tried the throttle reset, instruction below. It makes a big difference.
The auto stick does act a little quirky, kind of a lag on downshifts, make sure the w/s switch is in s position. I am a short 990 miles north of Dallas, Some one in your area should reply soon.

1. Get in your car

2. Turn the key to the on (not start) position, the position just before the starter
turns over.

3. Press the gas pedal to the floor with the key in the "on" position.

4. Hold the pedal to the floor for five seconds, then turn the key back
to the "off" position (don't remove the key), then release the gas
pedal.

5. Wait 2 mins. for a full alignment.

6. Drive the car as you always do.