earlier today after refueling my honda started idling rough and when stopping at a red light seemed as if it was going to cut off but didnt,the problem would disapper when speading up,it disappeared entirely after driving home but i noticed that the emmision control light was on,i cut the car off and started it again and the light stayed on. i opened the gas port and thightened the gas cap 4 clicks and the light went off.im puzzled at this point.did that fix it or should i drive it to see if it comes back on.