My car start similar **** not too long ago. Do you have a rear trunk battery? If so, do you have a nice 0 gauge or so wire going from the block to the chassis? Make sure that all your ground points are sanded down properly. Is your MAF wired correctly? This is Nick's old car right? If so, I doubt anything is hacked on the harness. Did the car have a Z32 maf at one point? I am guessing it was wired back to stock but make sure that everything is proper.
Also, go check the small ground wires that go to the intake manifold above the throttle body. There should be (2) 10mm screws holding on some grounds coming off of the harness. I took a wire wheel to those and cleaned the IM off as well as the female connector end of the harness. Check for the main ground that is above the thermostat housing and that the wire is solid and clean of any dirt/grease/corrosion. Hopefully this made sense, if not, sorry but its late! Lol.