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Hello,
Have you tried following the idle adjustment procedure outlined in the FSM? It is quite specific and has several steps that must be done in the correct order. Also is there any noticeable difference in performance when the engine is cold vs warmed up? If the coolant temperature sensor connected to the ECU is faulty the ECU sees the engine as always cold and injects much more fuel than it should (with a cold engine fuel evaporation is poor so excess fuel is injected). Since the idle setup is supposed to be done with the engine warm this could explain why the consult system is locking you out.
If you are getting a knock sensor error code the ECU will retard spark timing to a safe level that will not induce knock, even on regular gas. This is probably around 5 deg, but the amount of retard may vary throughout the map, I haven't measured it personally. I highly recommend installing a new Nissan knock sensor.
If none of the procedures in the FSM work out (see S14 FSM pages EC-35 to EC-40 and the trouble diagnosis section that follows) the throttle plate stop screw may have been adjusted too far in, backing it out could help. Good luck.
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