Random stalling of the engine??

[Supra2NR]

I would be inclined to suspect the timing or fuel delivery

thats the word i was looking for "timing"
that could be it, or combination of all of the mentioned above

my friends car is jus like that, after he drives it hard for about 5-10 mins
it dies in the middle of the road, but that was his turbo's fault it was jus too small for that car
i doubt that the problems with urs