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There are a few things that can cause this rough idle condition. I will list the most common for you.
The most common cause for this condition is a faulty mass air flow sensor, air or vacuum leak or faulty engine/motor mounts. Ford has a TSB for this condition caused by a faulty "dog bone" or motor mount. It is TSB 11-3-24.
Another possible cause would be incorrect camshaft timing or a loose timing chain which can and will affect the engine idle. I would check engine vacuum to ensure is is nice and smooth and withing specifications. Also, dont forget about the spark plugs and ignition coils as they can cause the engine to misfire if they go bad. I have even seen these cause misfires without even setting a trouble codes in the computer.
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