The 2 and 6 coil banks do not fire. Have changed around all the coils

2 and 6 are on different coils, the coils go 1+4, 2+5, and 3+6. The 91 - 93's all have computer problems. You must be using a known good computer. The computer signals the ptu (ignition module), which then fires the coils. So its either the coils, ptu, computer, or wiring issue.