Hi guys, have a real head scratcher here, making me go crazy ?! Rebuilt the engine over the winter, installed it last week, turns over, won't fire. Has new battery, new fuel, injectors work, has spark, has air, electronics work, no fault codes... And it won't fire up !!!! All sensors and cables are correct, the timing seems to be done right and used the locking pins during rebuild so assuming the timing is good.... At a complete loss here ! Frustrated as hell, any thoughts ???