I have had my Accent now for 9 years. Purchased brand new...only had 13 miles on it. Since then I have had to have the tranny either rebuilt or replaced three times. Now all of a sudden the check engine light flashes on and off a few times then goes off almost immediately after fueling up. It idles a little ruff then smooths out when the light starts flashing. It will then go off and it starts idling a little ruff again. The light does not come on while driving. It just started doing this with the last tank of gas and just did it again this afternoon when I filled up. What could be the culprit? I know the gas cap is on tight. I always turn it past four clicks...so I know it's not that. The only other time the check engine light has ever come on in this car was because of a bad spark plug. Any help would be great. Can't afford major repairs right now. Back up car was totaled and have to find a cheap replacement as this one just isn't that reliable.