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Yeah I agree it could have been bad gas. You don't know what you're getting when you're in Nowhere-Ville, how long their premium gas stock has been sitting. I'm not an expert on gas, but I generally avoid gas stations that wouldn't have a lot of customers buying premium.
But who knows what the newer ECU programming is. If it persists, I'd consider getting the car tuned and start monitoring stuff.
To add, are you guys sure that it's not normal operation? Do you get a stumble or is it truly rough all the time? The stumbling idle is pretty much normal if you operate window switches and other electrics at idle.
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