The Electronic Spark Control (ESC) module on a 1994 Chevy Caprice with the 4.3L V6 (it's not a V8) is
integrated into the ignition control module (ICM). There isn't a separate ESC module like on some other vehicles. The ICM itself is usually located on the driver's side of the engine, near the distributor. However, the exact location can vary slightly depending on the specific engine configuration.
To be sure, you should consult a repair manual specific to your 1994 Chevy Caprice 4.3L. A Haynes or Chilton manual would be a good resource, showing diagrams and pictures of the engine bay.
