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Thanks for the video. This doesn't sound like rough idle, that sounds like it's running only on 3 cylinders / one bank.
Can you rev it up? Or does it only run on idle like shown in the video and does it die if you press the throttle?
Did you check the coolant water for oil? Any cracks in the engine housing?
Do you have the possibility to do a compression test / or have you done a compression test on each cylinder?
Did you check if the injectors work correctly?
Have you tested the ignition coils? Are the coil packs OK or do some of them have cracks?
Regards, Markus
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