No spark on 2 and 3

[MNRIDER10]

I am having the same problem but I am getting spark on 2 & 3 not on 1 & 4! I have swapped out everything including CAS, power transistor, plugs, wires and coil packs. I am running AEM v1 on a 6 bolt buschur block and head. I am just stumped. I am getting plenty of fuel and enough fuel to actually backfire ever probably ten cycles or so of cranking the car over. Any suggestions????