My girlfriends Grand Am was about out of gas so before work today I went and put in about 4 gallons and drove it straight home (about 4 blocks). As soon as she went to drive it, it ran for like 2 seconds and died. Now when trying to start it I just get a low quiet "wah wah" sound and im hoping its just bad gas kus it rained here really heavy a day or two back. What are some things I can do to diagnose it further and make sure thats whats wrong with it??