on the distributor under the cap with two female connectors in it.
The ignition control module on a 2000 Blazer with the 4.3 is mounted on the same bracket that the coil is mounted to.
1995 and earlier models use a separate ESC module mounted near the throttle body of TBI
I believe in 93 they had the newer style computer, this eliminated the electronic spark control module.
The ESC module is in the distributor
It includes the coils and is bolted to the passenger side of the engine block. It is best accessed from under the vehicle.
go to corvetteforum.com
Generally if the spark control module on an engine is bad, the car will run roughly. It will likely miss and die at low idle speeds.
It controls the ignition system.
in the distributor cap
Right next to the gas moduale
coil, wire, ignition control module
Ignition Control Module.