Ive recently gotten my 86 going, there is still a vacuum leak (it keeps hunting for idol) which i still need to find. Everything else seems ok, timing is perfect, fuel pressure is good (adjusted the regulator to sit at 32psi at idol). And as far as i can tell ECU is fine.
It hesitates to rev down low then revs well for a bit (about 1500 revs) then just goes dead.

If anyone could give me an idea of what to check i would very much appreciate it.

Cheers guys, Jase