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2002 Hyundai XG350 Backfires

2002 Hyundai XG350 Backfires upon startup? What is causing this and is it safe to drive?

Odometer mileage?
Maintenance history?

Bought the car used at 33k miles; has 99K miles now. Nothing major has been done, brakes, tune ups, regular oil changes, fix a transmission leak,that’s it. Some one told me to run premium gas to see if that clears the backfiring.