Throttle Position Sensor (TPS)
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1990 Pontiac Sunbird, 1990 Pontiac Grand Prix, 1990 Pontiac Grand Am, 1990 Pontiac 6000, and 1990 Oldsmobile Cutlass Supreme. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
On 4-cylinder models, TPS is not adjustable. For further testing, refer to SELF-DIAGNOSTICS article in this section.