MISSFIRE ON BANK 2&3

Not sure if anybody has come across the same issue

I’ve recently took my gearbox out after a failure at brands hatch , upon reinstalling it the car has now developed a misfire

Only on bank 2/3

I’ve replaced plugs , coil & leads

I have power to the injector plugs but when I unplug injector 2/3 when the cars running it makes no difference at all

I can also u plug coil 2/3 whilst the cars running and still no change

Have also tried another set of injectors and the same thing happens

I’ve continuity tested / load tested the cables from the coil pack back to ecu pins and there all fine

Cheers

If wiring all good ecu might be dead.

Check actual usuable spark and fuel delivery.
Remove cylinder 2/3 spark plugs from head, but keep connected to leads/coil. Remove power to injectors, then crank engine and visually inspect spark.
If spark is ok. Supply power back to injectors and remove fuel rail with injectors and place onto some cardboard. Crank the engine and see if you have even fuel delivery across all cylinders.
If any of one of these things is not as it should be. Even after part replacement and cable continuity and load testing. As Brigsy said, check ECU.