There is a re-learn for accelerator position that may help in some cases:
FOLLOW THESE INSTRUCTIONS CAREFULLY TO ENSURE CORRECT FITMENT AND OPERATION
STEP 1-Disconnect battery for 5 minutes. Reconnect or use a code reader to clear any stored codes in the computer. NOTE: IF THIS IS A NEW INSTALL, PROCEED TO STEP 2. STEP 2- Turn ignition key to on position, do not start the engine. STEP 3- Slowly depress the gas pedal to the floor, and then slowly release it. Do this three (3) times. On the third press hold pedal to the floor until the check engine light flashes release the pedal and turn the key off. STEP 4- Now start engine. The gas pedal is now in synch with the larger throttle body.