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Got rid of it about 3 weeks ago, tried replacing injectors, got fuel tank cleaned, re-tuned, replaces sparks and coils ect spent about 3.5k and still no better

Please help https://forums.justcommodores.com.au/threads/rough-idle-sv6.276415/

I have a 2013 vf sv6 ute; it’s done around 100,000kms when it starts cold it has an occasional violent shake and when pulling up at lights ect idiling the revs drop and you can hear the car rev itself back up or it sits there struggling. It does not trigger an engine code, the coil packs have...