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I've been through engine codes, and computer releatn at the dealer, still had a rough idle until my original coil took a crap, and I replaced it and no more rough idle. Although NAPA's replacement coil works I replaced it before a year was up, and we'll see how long this one lasts.
 

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Even best of the best Motorcraft coils go bad frequently on zetecs, the coil design is too compact and heats up to crack, then moisture gets in to make it miss.

Rough idle on a zetec is commonly a vacuum leak or ignition issue.
 
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