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Depending on severity, this may be a problem with the idle air control (IAC) valve. This part is in charge or regulating airflow to maintain a smooth idle during cold start. The idle should start a little high, like 1300 rpm, and taper down over the first minute or so.
You need to see if the behavior is within parameters before bothering to change this out. Some of these are not that easy to remove from what I've read.
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