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cracked intake manifold

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02 gt:
I have a 2002 GT 4.6 with a intermitten miss on #1, changed coil and plug and ran fine for about 2-3 weeks then the problem started again.  Took it in to the ford shop and it was diagonised as cracked intake manifold.  It has never leaked coolant.  Why would changing plug work for a time.  Plug looks good when removed.  Hate to change the manifold and not be the problem.  Any Ideas

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