IslandRX7

Hey everyone i am a gm mechanic that has got into a stock rebuild of a 1986 mazda rx7 13b fuel injected. I am looking for help on a problem with a bad running car at times and others runs like it has been racing for years(good) it gets in these moods where it is hard to start and when it does start it wont rev up over 3000 no matter what. New wires, does not matter temp wet dry driving or sitting in a lot idling just does this randomly. Asuming a wiring problem but cant find it any help on this please let me know its driving me crazy!! lol

Also looking to find parts for it body parts, engine parts, interior parts anything, im from eastern canada and no junk yards got any avalible.

Any help and ideas welcome!!
Daniel Desroches