[Cnta]

I was wondering if anyone has had the same problem. I have a i30 1.6 Nline MHEV. Anytime I sink the boot it is juddering a lot. I have had the car back to Hyundai four our five times getting the issue looked at and the have changed the spark plugs and the changed the wiring to the plugs. I have a basic ODB reader and it’s saying it’s a misfire issue. What do I do ?

[Greyhound]

I think your primary course of action is to get the problem escalated with Hyundai. Is the issue intermittent, if true then maybe they need the car for an extended period and should give you a loan car whilst they investigate when the problem occurs. It depends on your relationship with the dealer and competence of the dealer, but for sure needs to be fixed under warranty before that expires.
If they have explored all electrical issues then maybe missfire is fuel related.