if you had been closer then i would have suggested you bring car to me and i would have sorted it for you, but at the mo were fully booked till december time!
i think if i were you i would either bring the car to someone like ed (fusion motorsport) in surrey and let him take a look at the map on it as it could well be a mapping problem.
or failing that
stick a standard afm on it and ecu and see if it runs all ok with those fitted. if so then its definately either a wiring fault with the z32 or a mapping problem.
just cant believe that no ones been able to sort this out down your end:roll: