Originally Posted by matmatician
It may be your intake manifold if they have the same issue that the 2.0 duratec has. They have little runner flaps (kinda like the butterfly valves on a carbeuretor) and those tend to wear out between 80-100k miles. If thats the root of the problem, dont worry about it. Like I said though, i'm not sure that a problem on the Zetecs, it may only be for the Duratecs.
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