Start by checking the computer ground close to computer. Use test light and check for voltage at coil positive. If this is good place test light on coil negative the light should blink when cranking. If it blinks and won't start replace module on side of distributor. Remember to mark rotor and base of distributor so you can reinstall. If it don't blink replace the PIP.
A deep 7/32 or 5.5mm socket fits the nuts. KD makes a small tool.
If no power to the coil replace the relay for the computer.
As both the PIP or Module will heat up and quit working you need to check when it won't start.
I have a module tester and they check good. I then put a drop of water on the metal plate and heater with a blow dryer and quit as soon as I observe a bubble. Many quit working when hot and start working when cool. It takes a tool to replace the PIP purchase a junk yard or rebuilt if the PIP is bad. Replace the distributor cap if corroded or no vent.