Where is the pcm located on a 1989 Chevy S10 pickup 4.3 liter?

On a 1989 Chevy S10 pickup with a 4.3L engine, the Powertrain Control Module (PCM), often called the ECM (Engine Control Module) in older vehicles, is typically located under the hood, near the firewall on the passenger side. It's usually mounted to the inner fender well. However, the exact position can vary slightly depending on options and specific trim level. You might need to do some searching in that area to locate it; it's often a rectangular black box with wiring harnesses attached.