general problems of the 2006 Lincoln Mark

I picked up my truck from dealership for recall and warrenty issues. Drove an hour and a half, parked my car. Returned home that hour and a half, came to a complete stop at a traffic light,close to home. While I was stopped the truck accellerated, now with both feet on the brake, I still hit the car ahead of me. Fortunetly due to my quick reaction, the damage was only to my bumper. None to the other car. I called the dealership and asked them if when they had the dashboard all appart for 2 days, could they have done something? of course they said no. They told me that my foot was probally on both the accellerator and brake at the same time? I looked at it and they are not that close together. Also I was already at a complete stop when it happend. I am to scared to get close to any car now. I have only drove the car as needed, for fear it might happen again. It's been 2 days now, it has not happend again. Yet. I have been with this truck since it was new, this never happend before.