hey scotty how are you my wife have a 2005 chevy cobalt replace both purge valves gas cap throttle body cleaned injectors but every time she goes to fill up gas the car dont want to start and she let it sit for about 5 mintues it will start when she hit the breaks or stop at a traffic light it idles down and sometimes go dead i was thinking maybe mass air flow sensor or fuel pump but i know you would stir me in the right direction thanks

often a bad evap cannister vent valve, try that first