i30 N bad stutter problem

[kaneti]

so i started having this issue a week ago, could not find what it is.
when driving slowly car runs just perfect, accelerating slowly into higher revs then flooring it also works.
at first i thought it could have been a bad sparkplug, changed sparkplugs and also coils but unfortunately it did not fix it.
checked for fuel rail pressure on obd2 scanner and it seems stable even while stuttering like this.
i also get no fault codes

 

[Bu11eT]

check low pressure as well, not just rail pressure

 

[Bookface]

I just had something very similar on my pfl manual. It was the high pressure fuel pump. Hyundai have issued a recall in Australia and New Zealand for it to have the pump replaced. Here in the UK it was just a technical service bulletin for an ECU tweak that my dealer did in February, but it seems to have failed anyway. I got an engine warning light a couple of days after mine started doing it though, throwing up fault code P0088.