Yeah my ECU isn't so stock anymore so is no use.....but Marc is correct you can put the manual one in and everything will work A-OK except you'll be stuck in 3rd
I don't understand why the GTt isn't like the N/A model and has the auto-shift computer built into the actual car not the ECU :S
So who told you about the "common fault" I've never heard of anything go with the R34 ECU's ever, ever, ever....maybe we can diagnose via the internets for you?
Try calling Markimak or his brother, they've got the ECU from the stacked R34 that they could lend as far as I know, linky, linky
http://www.skylinesaustralia.com/forums/Wr...34-t176434.html