Thanks. Looks like one way to do it is disconnect the battery cables and hold them together for 20 minutes to do a "hard reset".
Another:
Quote:

I've also heard about resetting/recal the throttle calibration: I have not tries this yet. Some say it works and some say it doesn't
1) Push button to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Push button to "OFF".
6) Start the engine.
Most drivers notice an immediate change in throttle response, but depending on your driving style, you may need to repeat this procedure periodically due to the computer's adaptive programming. You likely need to repeat this procedure any time the battery is disconnected.