2003 lincoln aviator intake manifold tuning valve question: my mechanic advises that I have a trouble code that shows a stuck intake manifold valve. He contacted lincoln mechanic, and was told the only cure was to replace the whole intake manifold with a new one, at a cost of $2500 plus. I am looking for alternative fix. I read on a forum (which I can't find now) that the valve can be freed up, once the manifold is removed. Is there any way to free the valve without removing/replacing manifold?