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For what it's worth, after swapping plugs and coils, my theory for the rough startup was a bad fuel injector that was leaking fuel onto the plug, causing a rough startup. However, the dealer swapped fuel injectors between cylinders and the misfire persisted on cylinder 1. At that point, the next running theory was that the valve stem seals were failing, causing oil to drip into the cylinder, resulting in a rough startup.
So fuel injectors, or valve stem seals, could be possible culprits for a rough startup.
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