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I doubt it would be the factory ECU as they are pretty primitave in the R30 and R31's.
If the car idles fine and is fine under normal driving conditions other than at WOT then the AFM will be ok.
Assuming your car is fairly standard here, what sort of spark plugs are you running? In the RB20DET you should be using NGK platinums part number PFR6A-11. Set the gap to .9 mm or .035 inch.
While your there check the carbon tips on the coil packs. Depending on which style you have there should be a spring with a carbon tip. If the spring is weak then the carbon tip will not make good contact with the plug. You can gentely shave it down to make it square again and good contact with the top of the plug. Which brings me to another thing. Be very careful removing them as the wires and coil packs themselves will be brittle.
Another thing to check is for any splits in your induction hoses or loose clamps. What could be happening is a boost leak, a small one will cause you grief. The AFM will be seeing more air than what will actually reach the engine causing an over fueling situation.
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1992 Silver R32 GTR tickled to 450hp. - Sold when I left NZ in 2004
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