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So I have a 2000 Zetec SE sedan. and i have noticed a little stumble at idle and at WOT and i decided to try some newplugs. it currently had some beatup old motorcrafts in it and i replaced them with Autilife double platnums (or something liek that). well the car could hardly run.. something went wrong. anyways i put the old ones back in and it runs just liek it did before??
what should i do? or better yet what did i do wrong??
what should i do? or better yet what did i do wrong??