Sounds like your intake hose is coming off of the MAF. Look at the air box and you will see the hose leading to the intake. In between the air box and intake is a MAF. Which is a Mass Air Flow meter. Usually on the side towards the intake the hose will come off. When you take off from a stop the engine moves and then pulls the hose off. Then you let of the gas and the hose goes back on the MAF. There is a campain for this to fix the problem. You are still covered under warranty if your not over 60k in miles. The TSB for this problem is 05-20-003-1. Oh ya.. Hyundai is no were near the days of Exel's.. They are just having some little production problems. With all the new stuff there are bound to be some issues.
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