Throttle Position (TP) Sensor
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Hombre, and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
See THROTTLE POSITION (TP) SENSOR OR THROTTLE SWITCH
in ON-VEHICLE ADJUSTMENTS article for throttle position sensor/switch adjustment procedures.