Mazda Verisa Engine Sound

I have a 2004 Mazda Verisa that's done 70000km (about 43000 miles). The engine sounds quite rough when it revs, but only when it's cold. After a few minutes it goes away and sounds normal.

I recorded the sound here (sorry just ignore the shaky cam!): http://www.youtube.com/watch?v=frHAUEMFwBg

(It sounds worse when it's colder, so I'll try recording another video at night).

Does anyone know what could cause this? I'm guessing it has something to do with the oil warming up, making the sound go away?
 
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