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Sorry mp302007, I have to disagree with most of what you've said!
The GTR does not 'feed' 3 cylinders with one turbo and 3 with the other, they join just after the turbos, share an intercooler and share the inlet plenum. There would be a difference in exhaust restriction if one had a problem but not to a level that should cause such a sudden / violent reaction.
Timing is also not retarded as revs build, in fact the opposite is true.
TT - Monitor AFM voltages as you've suggested, it's unlikely that both turbos have gone at the same time so if there are big differences between the two readings then i would start pulling off pipework and turbo elbows to check. I guess it might also be worth swapping afms around to see if the problem moves before you start pulling it to bits. In any case, do the minimum amount of running you possible can in this state!
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