2003 Ford Expedition cruise control problems

Tl* the contact owns a 2003 ford expedition. The contact stated that while driving 40 MPH and attempted a right turn, the vehicle abnormally accelerated. The vehicle would not stop despite the contacts attempts to brake and the vehicle proceeded to drive onto the pedestrian sidewalk. The contact struck a pedestrian and the pedestrian was killed. The contact sustained injuries to the hands and feet. A passenger sustained injuries to the neck and right foot. The vehicle was destroyed.

The car was running well and suddenly it die. No lights in dash board, no shakes, no any previous sign of trouble. Simply it die. I pumped the accelerator pedal and the car continue running. Next time, few days after the incident, the car does the same. This time do not continue running when I pump gas. I have to put in neutral and start it again. It start at once. Could be more than two weeks without signal of problem and then, it happen again. Some other time, it happen 4 or 5 times in a half hour trip.