i was driving down the road and i noticed my speedometer was off by 25-30 mph. There is no way i was driving 65 down a 45mph zone. Then, my car like... missfired? then it died on me. I am not sure what it could be. the car does start but once ive been driving it for a few min, it will just cut off. Anyone have any ideas? im thinking.. starter? alternator? battery? or even a fuel pump? i hope its not the fuel pump. Suggestions please. Thanks