Where is the electronic spark control module located at in a Chevy selverado 94?

In a 1994 Chevy Silverado, the Electronic Spark Control (ESC) module, also sometimes referred to as the Ignition Control Module (ICM), is typically located on the distributor. It's not a separate box; it's integrated into the distributor itself.

To be absolutely certain, you should consult a repair manual specific to your 1994 Silverado's engine (e.g., a Haynes or Chilton manual). The exact location might vary slightly depending on the engine type (e.g., 4.3L, 5.0L, 5.7L, etc.). The manual will have diagrams showing the location of all components.