Cant get rb20 to stay running after nistune and other mods

[mattk]

Finally got my build to a conclusion and had troubles getting the thing to run proper. The only thing that needed to be adjusted on nistune is the injector size and the afm. I have tried the base tune for 550cc injectors and a z32 maf from ams. The maf is new but is not reading correct values at just key on. Its reading 1.885volts when it should be reading 0.5 volts i believe. Although thats not the main issue as the car should be able to idle with maf unplugged. I have plenty of fuel and spark, so much fuel i had to end up turning fuel pressure down to 5 psi to run and not be to rich and even then it ran for three mins and i havent been able to start again. It ran very well for those three mins though. Ive tried agjusting the k constant for the injectors but have not had much luck. while the car was running it was still rich at 10.4:1.
Very tired at the moment from trying many different things tonight. Hopefully most of the above makes sense. So my question is, has any one else have had similiar problems like this, or any suggestions for where i should go from here.

Matt

[Gts_Junior]

try programming for the stock maf and see if you can single out if the transfer you did from the rb20det maf to the z32 maf so essentially try going back to the factory maf by re wiring it backl to original then you can single out if you did the wiring for the z32 maf correctly