Hi, My 2000 Pontiac Sunfire has, for the second time, had the check engine light come on solid (not flashing). It does seemed to idle a little rough andseems to almost miss a little when you are driving and just barely pressing the pedal. Could this be caused by the fuel filter? I have 54,000 miles on it and have never changed the fuel filter. If so, does anyone know how easy or difficult it is to remove and install a new filter? Thanks for any advice.