I have a 2000 Sentra gxe with the 1.8, I have 2 cylinders with great spark and 2 with none at all. All injectors work. Coils and plugs have been replaced. Ecm relay is good as well as all fuses. When I turn the key on I don’t get a service engine light but I can pull codes. It has a P1320 code for ignition circuit. I have 12v at all coil plugs as well as good grounds at all plugs, wire has been checked from ecu to coils with no issues. I can’t for the life of me figure out why just 2 cylinders are firing and the other 2 don’t fire AT ALL.