cylinder 2 4 6 missfiring

[Chevvyorange]

2007 commodore alloytech LEO 3.6 V6. developed missfire in cylinders 2 4 6.
anyone knows where earth or ground wire are for the cylinder banks or the injectors?
please if anyone could help I've tried coils, spark plugs seem fine, compression is ok, cats are ok and got timing chain replaced
if anyone knows a wiring fault?

 

[HaydenB86]

There's a fuse for odd and even injectors in the engine bay fuse box.

 

[Fu Manchu]

There’s a sticky in the VZ section

 

[Fu Manchu]

Try this https://forums.justcommodores.com.au/threads/alloytec-random-multiple-misfire-cyl-1-3-5.241540/