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Evap system. If the car has been topped off too many times (even once it too many time IMHO), the evap system charcoal cannister gets clogged up and the evap system will cause probs with hard starting and maybe rough idle. If you get a CEL P0442 then that's what it is. It could be in the rough start only stage and not cause a CEL yet, but keep an eye on it.
That said, there are a million things that can cause a rough start, this is only one suggestion.
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