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Just downloaded the Nissan Data Scan 1.51 manual - it looks the goods and the software is $49.95 to purchase. Have sent them a couple of questions regarding patrols and will let you know the outcome. Haven't bought it yet until I know it will work, but the trial version definitely does.
That cylinder test I did before was actually correct - according to the manual, you select the cylinder you want to shut off to ensure it's working (that is, the engine should run rough like mine did) - if no change, then that cylinder has a fuel delivery or ignition issue ... phew, sounds like this could be fun!!!
We'll make a mechanic out of you yet mate...well done. Hope it does what you need it to!!