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Yup!.....go into FAR more detail & include service info. (spark plug age etc.) + any mods. or previous problems & we`ll try to help you!.
Engine-fault diagnosis is VERY difficult via the Internet & it is almost always best to have the fault-codes (which will be stored in your car`s ECU) read by a Hyundai Dealership.
Cheers, Nick. :)
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