Hyundai Accent misfire codes

Asked by Jun 07, 2019 at 05:28 PM about the 2009 Hyundai Accent

Question type: Maintenance & Repair

I have an 09 accent. Car runs fine. Only when i go
over 55 mph the ck eng light blinks. Sometimes it
stays on some times it doesn't. The codes are
p301 p304. I have done the wires and the coils. If
the light stays on it will go off on its own in a few
days. Any ideas. Whole time car runs perfectly fine.
Even the mechanic says it isn't misfiring.

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