I have a 1998 ford taurus and I just had annual maintenence done on it, oil change, tune up and things of that nature, the car runs great, but I went to pump gas into it and before the attendant put the gas cap back on, I started the car, now my service engine soon light is on, I made certain the gas cap was on correctly, but the light is still on. I brang it into a service shop and they tell me, it is nothing, next time don't start my car until the gas cap is closed, I am worried that even though my car drives great, there might be more of a problem in the future, I want to fix things now before they get out of hand, the only thing is I don't know what to fix