general problems of the 2011 Mazda MAZDA6

Fuel overflowed during a routine fuel fill up at a national gas chain in the philadelphia area. Gas continued to spew out uncontrollably until the pump was manually shut off by hand.

I have had an ongoing issue since I purchased my Mazda 6 2011, if I slow down or stop for a traffic light and then try to accelerate the gas pedal is to the floor and the car doesn't move, then out of nowhere it will accelerate. I was told the voltage in the gas pedal censor and the censor in the engine were not the same voltage, both were replaced but I still continue to have problems and the dealership cannot find out what the problem is. My car has been back in to Mazda 3 times but no solution, as this is extremely dangerous in heavy traffic I wish someone could figure this out before I get into a serious accident.