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Q:

upon start up, engine runs rough until driving 10 minutes or so. on 2001 Ford Focus

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I drive my car seldom [twice a week]. All city driving, maybe 25 miles a week. I use synthetic oil.
(2) Answers
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No check engine light? I say check the plugs and search for vacuum leaks. As the parts heat up they expand a seal up gaskets that leak when cold. Start and let us know. Good luck.
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There are some vacuum lines that corode from oil and there are cold idle systems that should raise the idle until the engine systems warm up... sounds like we need more information to give a better answer...
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