Did you try this?


PCM Zero/Span Throttle Calibration

Throttle calibration can substantially improve throttle responsiveness over "factory standard."

Many people notice what appears to be sluggish throttle response or a "dead area" at initial accelerator depression.

Throttle calibration can take care of these issues.

Procedure steps:

1) Insert ignition key and turn 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) Turn the ignition key 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.