My 2018 did the same thing and it ended up being the ignition coils and spark plugs that needed replacing.
Best Ignition coil for Hyundai Elantra
Pros: fixed the issue
Vehicle:
Hyundai Elantra
I have a 2017 with the 2.0L. 102k miles. Got the Beck Arnley gen2 coils & Denso plugs gapped at 0.032 and have issues misfiring under load in 5th & 6th gear. Also happens more with the AC on. Otherwise it drives fine.
Pros: drives fine otherwise
Cons: misfiring under load
Vehicle:
Hyundai Elantra
Mileage: 164149 km
Replaced with Delphi coils and it hardly bucks, still does but not as bad as oem once in a blue moon for a half a sec.
Pros: hardly bucks
Cons: still bucks
Vehicle:
Hyundai Elantra
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