Unplug the PCM Computer.
You can also unplug the SPOUT jumper sometimes but if the IDM input in the computer is bad this will not help.
So it is best to just unplug the PCM Computer.

You need the ICM (Ignition Control Module AKA TFI) for the spark but you do not need the PCM Computer for spark.
The PCM Computer can stop the spark from happening.

The engine will not start with the PCM Computer unplugged as the injectors will not fire. But you could spray starter fluid into the intake and it may fire with the PCM computer unplugged.

Also note that bad wiring from the PCM Computer plug to the ignition system can also stop the spark also if it is shorted to ground.