Chevy throttle sensor issue

The Throttle Position Sensor (TPS) is connected to the throttle shaft on the throttle body1. Disconnect the negative battery cable.
2. If necessary, remove the air cleaner assembly along with the necessary duct work.
3. Unfasten the TPS attaching screws. If the TPS is riveted to the throttle body, it will be necessary to drill out the rivets.
4. Remove the TPS from the throttle body assembly. If equipped, inspect the TPS O-ring and replace if necessary.

WARNING
The throttle position sensor is an electrical component and should not be immersed in any type of liquid solvent or cleaner, as damage may result.
To install:

5. With the throttle valve closed, install the TPS onto the throttle shaft. Rotate the TPS counterclockwise to align the mounting holes. Install the retaining screws or rivets. Tighten the retaining screws to 18 inch lbs. (2.0 Nm).
6. Install the air cleaner assembly and connect the negative battery cable.