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this car had been sitting for about 5 years with minimal use. until last year it started being used at least once a week and had been running fine since. and then until last week it started running rough and would hesitate when stepping on the gas and is jumpy at just about any speed. it also idles rough and idle speed sounds slower. if it helps at all its the 305 V8.
 

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First thing I would check is vacuum leaks on the vacuum lines. You may find that one or more vacuum hoses have gone bad and allowing more air to enter the carburator than it should get. Follow the rubber lines from the carb and see if you find one(s) that are broken, unhooked, or weather cracked.

Post if you need more info. Kenny
 

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Cap, rotor, plugs, fuel filter....basic maintenence.
 
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