I recently cleaned out the valve using carb cleaner. The car was fine for a day or so, now it wants to idle high all of the time even at rest. I suspect the valve is just bad. I am not willing to spend the $277, so I am going to buy used. Do these valves just "go"? I figure it has to do with the mechanism that opens and closes the valve. The valve was cleaned and lubricated using the how-to. Right now the valve is unplugged because it can't be used like this.