Where is computer located on 1994 Chevrolet silverado?

There is no computer in the sense of a separate box or unit like a desktop computer in a 1994 Chevrolet Silverado. The "computer" is the Powertrain Control Module (PCM), also sometimes referred to as the Engine Control Unit (ECU). This is a complex electronic control unit and is located somewhere within the engine compartment, often near the firewall or under the dashboard. The exact location can vary slightly depending on the specific Silverado model and trim level. You'll likely need to consult a repair manual or online forum specific to your truck's year and model to find its precise location.