Fuel Delivery Problems of Hyundai XG350

I bought the 2004 Hyundai Xg350 in February 05. In summer of 06 I began having problems with the digital reading of miles togo before "e". It does not reset when gas has been put in, it takes a few turns of the key to register. I was driving my son to school one morning and as I tried to accelerate to go up a hill the car began to studder, check engine light appeared,it felt like something wasnt catching in order for the vehicle to move. When I stopped a the red light and slowly took my foot off the brake it would lunge forward. I ended up having to have it towed to the dealer. Of course the problem didnt happen when they test drove. They changed the sensor and it hasnt been symptom free. Still slow to reset gas mileage, still studders, check engine light. When it starts to studder I am able to drive under 60mph, shifting drive 1-2-3 like a stick shift. Once I try to go over 60 miles per hour (highway) can not do it without continuous studder.

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