[nizmo240z]

Well I would try to get a wiring diagram so you can just unplug all the plugs then test for continuity at the main plug for engine computer to the sensors and injectors and so fourth. If all that checks out then you will have to pull the harness out and inspect all the wires with the wire loom all taken off and don't forget the grounds. If you can't get a wiring diagram then pull the harness all fallow each wire then test for continuity. Remember just cause the wire insulation looks fine doesn't mean that the wire is natural broken on the inside.