When does it become an addiction!

[ainarssems]

The cylinder-specific misfires are caused by bad ignition modules. Cyl 4 (worst misfire) is driven by channel 2 on module 1. Swap them over and the misfire moves to cyl 3 - driven by channel 2 on module 2. Its also reporting random multiple misfires (which wasn't solved by replacing the fuel) so all channels on both modules are suspect.

When ignition amplifier failed for 1 cylinder on mine it was also showing multiple random misfires on other cylinders. I guess un-burnt fuel and oxygen enters exhaust and affects lambda readings, ECU adjusts it wrong and non optimal fuel/air mixture throws up odd misfire in other cylinders. If there are a lot of misfires ( I think it was 100 or 200 in 1000 engine revolutions) ECU turns off injection for that cylinder to save catalyst from un-burnt fuel and switches to open loop and can cause an odd misfire on other cylinders again. After I replaced 1 ignition amp other misfires disappeared as well.

Mine had intermittent issue first gradually getting worse, I think amps develop dry joint in inner connections over time. I saved my old one and was going to cut it open and investigate but never got round it and don't even know where is it now or if I still have it.