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Engine likely flooded due to poor cold-start programming.
Actually, I've suspected this as an issue because my BRZ has sputtered on startup on occasion. Kinda ghetto for it having 3k miles on it. Makes you wonder how this thing will run with 100k miles.
But many imports I've owned have had these sorts of issues on cold starts. Not sure why. But if it does it again, try utilizing the flood control function. WOT while cranking for 15-20 second intervals should clean out any excessive fuel from the cylinders.
My wife's car didn't start doing this sputtering thing until we switched to ethanol/oxygenated fuels.
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