Where is the throttle body located on a 2001 Chevy Prizm?

On a 2001 Chevy Prizm (which is mechanically very similar to a Toyota Corolla of the same year), the throttle body is located on the intake manifold, at the top of the engine, near the air filter box. It's connected to the air intake system and sits between the air filter housing and the engine's intake ports. You'll likely see a large hose leading from the air filter box to it.