Cruise Control problems of the 2012 Dodge Ram 1500

I was exiting the hwy at about 80 km/h when out of no where the truck accelerated and I felt the gas pedal disappear under my foot. I was not using cruise control, the weather was normal and roads were dry. The truck accelerated up to 120km/h all on its on very quickly and my reaction was to brake, with both feet on the brake I was having difficulty trying to slow down, luckily there was no traffic in front of me for a few hundred yards. I then started gearing down to try and slow down which worked but the engine was still going full throttle, the engine light came on and there was a chime and the etc warning light came on to the right of the speedometer (a red lightening bolt) this went on for a few minutes and then out of no where just stopped and the gas pedal let up and the truck drove normally after that. Dodge dealer said the only code that came up was for driving with the brake and gas at the same time and said it was probably my driving that caused it and other than that the truck is fine. I use the same foot for the brake and gas and only did that at the time to slow down.