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  • karjunkie 09/22/08 5:23 pm PST

    Sounds like engine knock from bad gas to me. Did you refuel at a "no name" gas station on your trip? If so, try refueling at a Chevron Shell or Mobil gas station that has high quality gasoline with good additives. Being a 2004 Sonata, I assume you are still under warranty right? If the problem persists after the fuel change, I would take the car in under warranty.

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