I have an r32 skyline wa auto but converted to manual, just installed a fully rebuilt motor and can’t get it running right, #3 cylinder is not firing but I’ve tested the injector is pulsing when running, changed injector just in case, swapped the coils which made not difference so that ruled out coils because the miss remained in #3 cylinder, replaced the plugs to brand new ones, checked the wiring harness which had power, checked earths and injector leads, any ideas on what it could be?