I know this conversation has been talked about before. I am tired of the evap codes constantly that never stay fixed. Do you think it is worth just changing both valves at one time and be done with it? I know one may not be bad, but the small investment will not bother me if this will cure the problem for a few years. I am yet to even get under there and mess with anything. I clear the code and it stays off sometimes for a while (I don't use the truck much) and other times the light comes back on within 30 miles. Just looking for opinions on what people have had luck with.