2002 f4i have no idea whats wrong at first the onlly time anything went wrong was once in a great great while it would sputter if i held at steady speed fine if i got on it fine at idle well now it sputters as i go into cornders fi light comes on when fi light comes on bike stalls out but imediately fires right backup when i get on it it now will die out which its never done before but it still idles fine and runs great while in nuteral any sugestions im gonia start with a fuel filter just becuase its by far t he cheapest and its the only thing i can think of that would progressivly get worse like that i figured plugs but the plugs look ok and if that was what it is it would more than likely misfire on one cylynder but still not stall out like it does maybee im wrong though i need ideas... t hank you