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iTrader: (1)

I have a 98 civic coupe that has been sitting around since Oct 2005 and I've put about 10 miles on it since that time.When I got the car it had a rough idle after it warmed up,but before then it runs nice and smooth and even when I drive it,its nice and smooth,except when its idling.There's no RPM gauge,but I would say it just about 1k and seems like it might die,but then it just back up.So it goes UHHHHuhhhUHHHHuhhhhhUhhhh.There are no cel's.Could it be the gas is just old because when I got the car it had already been sitting up for about 5 months with a full tank of gas.Its almost been 1 yr with a full tank of gas.I'm hoping that all I need to do is burn the old gas and put some fuel injection cleaner and some supreme.Do you think the gas would make it idle like that.Its a very vague question,that would make more sense if you were to hear it.Any help would be highly appriciated.Thank you for your time.