Hi all , am writing this post on behalf of a friend of mine car in question is a Superb 2.0 ltr diesel BMP engine code ,it's been running like this on idle ever since the car required a short engine due to sever piston slap on number 1 , on idle at times it runs very rough , switch it off and it works nearly fine though not all the time .. All has been checked and replaced , a new head too , DPF is clear, fuel lines , tandem pump you name it ... someone even suggested alternator which we overhauled but car stayed the same , computer giving no faults .. The only thing untouched are the injectors , has anyone encountered such problem ... video of how engine's working on idle below ...

The video of the rough running Superb ... Can anyone help please ?.Tried looking on the net for similar problems but found nothing ...

Surely someone can help? :(