Z32 Fuel Injector Trouble Shooting:
This is a test if you feel that you have a fuel injector that has failed.
On the driver's side of the Timing belt cover there is a Sensor called a Crank Angle Sensor (CAS), it does exactly what the name refers to it as. There are three small bolts holding it to its mounting bracket. Remove all 3 bolts and you can spin the whole unit freely. As you do this, you should be able o hear all 6 fuel injectors fire releatedly. if you sense there is a gap as you rotate, you either have a failed injector and/or faulty wiring.
Keep in mind this isn't an end to all test but it can help you determine or eliminate a problem.
I will add more as i remember them...