Fill up with gas
i had the same problem, you have to change the perge control valve, its on the back of the engine below where the plastic intake pipe meets the metal intake manifold on the back side of the engine between the engine block and the firewall, on the underside of your car hood you will see a vacume system diagram, it will illistrate where the valve is, it should cost about 30 bucks or so at a hyundai dealership
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