...working normal? My infinity fx35 2004 today started and then died for the first time but then i pressed the gas pedal and it was running normal and was turning on fine later could it just be the gas i put in or what?

Might be time to change the fuel filter also, if it hasn't already been changed. If it was caused by a sensor, then the check engine light would have came on. If the light did come on, then you can get your car scanned at Advanced auto, or Autozone, and learn what code it produced. But I would start by changing the fuel filter.