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How many miles on the car? When was the last time the car had a tune up?
It's probably just a coincidence the motor idles rough after fill up...probably problem more attributed to a hot start condition. Those problems deal with worn spark plugs, dirty fuel filters and injectors, dirty air filter. If it really has something to do with your fuel tank......you might have a clogged screen on your fuel pump in the gas tank. Depending on where you are in the country, I would use a bottle of dry gas in the tank, just incase you have water from condesation build up in the tank.....should keep the tank full as possible in the winter....
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