Gas Recirculation Valve (egr Valve) problems of the 2008 Hyundai Santa Fe

While at a stop in a construction zone, my foot was on the brake, when the vehicle suddenly accelerated into the vehicle in front of me. Although my foot was planted hard on the brake, the engine continued racing, and it felt like my car was going to push his car down the street! I shifted into park and turned the car off. Luckily there was only $4,000 worth of damage to my car, and no one was hurt. I refused to drive it, and had it towed to the dealer. They said the computer showed no malfunction, and it had to be driver error. Three months later, it did it again to a lesser degree, in an open area. I turned the car off again, and it was fine until yesterday. It has been 4 months since that last incident, but this one even was worse than the first. Only thing is, now I know to put all my weight on the brake, shift to neutral and turn the car off as fast as I can. This one frightened me so badly, I will not drive it again. It is going to sit at the dealer until they find out what to do. I cannot in good conscience drive it, sell it or even trade it in until I know it is safe! every time it happened, the car was on a city street, stationary, and heading straight. The engine revs up so loud, it sounds like an airplane! yesterday I could tell the people in the car stopped next to me heard it and looked at me! I have owned this Santa Fe since it was brand new, and people tell me it looks like a new car. I keep up with the recommended maintenance and always take it to the dealer for service. Until last July, it has been an excellent car. The accident I had with it was the only accident I have had in 50 years of driving! please give me some ideas on what to tell the dealer to replace, repair or disconnect. Thanks for your help!.