No spark to #3&6plug replaced coils wires plugs and ignition control module

Sounds like an ecu going bad. signal goes from the ecu to the ignition control module to the coil, so if the coil and module are good its the ecu or the wiring. These cars in 91-92 all have leaking capacitors on the ecu board. Ecu must be rebuilt by a reputable builder or replaced.