Geez Zed thats a hard one to pinpoint while sitting behind a pc.
Ok some basics.
Id look at the ignition system.
If its got a distributor there should be an ignition module inside (like electronic ignition) that could start playing games or a wheel with cutouts inside the dizzy that run through a sensor which can get dirt inside or cause intermittant problems.
If it doesnt have a dizzy it will have a crank angle sensor either a sensor running near the crank or a unit hanging off the cam that works like a dizzys sensor.
Check your wiring plugs (connections).
Does it run an airflow meter (a box near the aircleaner with a plug in it)?
Check the connection, nissans are known to get dry solder joints inside the unit which can be cut open and repaired.
Also if the AFM is removed its good to clean it inside where the probe is with contact cleaner. It helps it get better airflow readings.
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