Sonata Turbo like to eat spark plugs,, porcelin break, fall down electrode and cover the spark,, or just break off and get eaten by turbo,, been there with Sonata already..
Check engine codes asap to see if there are misfires reported. Else check if all tubes/hoses are still well connected (no air leaks etc). Test with someone else in the car and using the gas pedal (just above 3000 rpm is fine).
If you hear anything hissing (except when you release the pedal) a hose might have a leak or a connection might have slipped of.
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