Need a little help finding the problem with my commodore

[Deegan_ vy]

My 2004 Vy 3.8L v6 commodore has a slight miss I’ve replaces the spark plug leads, spark plugs , DFI module and the coil packs but has changed nothing anyone have any idea what it is?

 

[krusing]

Depending on the plugs and leads purchased,
You could have purchased a faulty item, (plug, leads, DFI & coils)

Check the DFI plug that its ok

Get is scanned to see which cyl it is, then take it from there.

 

[Fu Manchu]

There are lots of counterfeit spark plugs out there on the market.

Get the belt off and give some of those pulleys a spin. It is of note s Holden service bulletins mentioning misfires due to bad accessory bearings. Check them out to rule out that as a cause.

 

[krusing]

I was thinking out of the square,
possible there is a vac leak on one of the cylinders, thinking it could be the LIM gaskets possibly,

That does all depend on the k’s, if they are still Original LIM gaskets,
Not saying it is, but just ruling out other things that may contribute to this fault.