I think the clue is in that it doesn't happen all the time.
The oxygen sensor could be the culprit, but I doubt it in a car that new. Alsl I think the car would run poorly all the time. It sounds more like a bad tune at idle, or like you said an injector. It could also be a bad spark plug (or improperly gapped plug) or a bad wire or distributor. The other thing to check out would be the coolant sensor. You said it calms down after it heats up. So if the collant sensor is going, then it would be easier to run on warmer days.
Of course start off with Marcos advice since it is free and easy.
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield
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