Which engine does your car have?
You can replace the ignition control module and the crankshaft position sensor as required.
The 1990 Chevy Celebrity engine is distributorless, the ignition is handled by a combination of the engine control module(computer) and the ignition control module. You did not mention which engine the car has. If your car has the 4 cylinder engine the ignition control module is below the intake manifold at the rear of the engine. You can follow the spark plug wires to it. The coils are mounted to the ignition control module. If your car has the V6 the ignition control module is near the starter and again you can follow the spark plug wires to it. Again the coils are mounted to the ignition control module.
How do you change the ignition control module in a 1988 Chevy Silverado 5.7L
Remove the wiring harness from your 1995 Chevy Blazer ignition control module. Remove the ignition control module retaining screws. Reverse the process to install your new ignition control module.
All 1987 to 1990 Chevy Celebrity engines use distributorless ignition. Timing is controlled by the engine control module in conjunction with the ignition module. There is no provision for adjustment.
there is no ignition control module on the 1996 model its all through the PCM
Disconnect the battery. Remove the ignition coils. Remove the ignition control module that was under the coils, and replace it.
The coils are bolted to the ignition control module, there is no coil wire as such.
I would suspect a failing ignition control module.
On the V6 the ignition module is under the distributor cap.
The 1987 Chevy Celebrity has distributor less ignition. The timing is controlled by the engine control module and there is no provision for adjustment.
The 1988 Chevy Celebrity uses distributorless ignition. There is no provision to alter timing, the engine control module takes care of that.