Having problems

I have a 2000 Pontiac Grand Am and the dash board lights come on and off every now and then. It seems when I drive the car on a warm day, the engine will not start. I have taken it in to several people and they have no clue whats wrong. They find nothing. I am thinking about changing the fuel filter but the engine never cuts off when I am driving. I am really thinking that there is some kind of electrical problem. Has anyone ever had this problem?