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I haven't had this problem but I'd start by purchasing or borrowing a quality scan tool and check for any soft codes. If it only occurs when cold Id guess it's fuel related, I'd thoroughly clean the throttle body, change the fuel filter, and make sure the fuel isn't contaminated with water or anything else just to eliminate the simple stuff first.
You could also run some Techtron in the fuel to attempt to clean out the fuel injectors. These are all simple relatively inexpensive things to try first before getting in deeper.
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