definitely sounds like a wiring problem.
lol i'm totally in tune with toyota world right now, i'm doing an aristo 2j gte in my 71 240z, an ls1 in my buddy's sc300, and the n/a 2j out of that sc300 is getting turbo'd and going into my little brother's fd rx7
so i got all 3 cars to wire up, and two 2j's to build >_<
so i have lots of wiring ahead.........that's my cup of tea though so it's just time....it could be worse...
i could be my buddy with the sc300 that has to do the fabricating on all 3 cars muwhahahha
anyways, double check your power supply routing, and also your start signal wire on the ecu is hooked up.
if you get fed up with it, i can go over the wiring and fix the issues for you.
best of luck,
Dave