It's on passenger side above the valve cover it is small square box on a bracket
I believe in 93 they had the newer style computer, this eliminated the electronic spark control module.
its inside the distributor.
The ignition control module on a 2000 Blazer with the 4.3 is mounted on the same bracket that the coil is mounted to.
It located as you are looking at the engine to the left of the tbi on a mounting bracket on top of the bracket it has a four wire connector connecting to the module
The ESC module is in the distributor
in the distributor cap
Yes.
It advances and retards the engine timing as needed.
According to my service manual, it should be on the passenger-side firewall, next to your fuel pump test connector. -Dave
Right next to the gas moduale
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.
Inside the distributor, under the rotor.