Most likely it is the manifold converter. If 4 cylinder, you have 1, if 6 cylinder you have 2 manifold cat. converters and probably 1 under car. these do NOT go bad by them self. A misfire in the engine due to spark plugs (motorcraft only) ignition coil, etc....If check engine light on, take it to Auto Zone, etc... and they will scan it for free. Get scan codes.. Po420 and po430 are codes for bad converter. Good Luck
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