Engine Controls - Adjustments: Inspection
WARNING: This page is about a different car, the 1997 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Check TP sensor resistance. See THROTTLE POSITION (TP) SENSOR under FUEL SYSTEM in SPECIFICATIONS article. If resistance is not as specified, adjust TP sensor.
NOTE:
On ES300, TP sensor adjustment procedure is not available from manufacturer. If TP sensor resistance is not to specification, replace sensor.