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86 corvette running rough
im working on my uncles 86 corvette i did the complete tune up plugs wires cap rotor gas filter oil filter the car has 62,000 miles on it it was sitting for a long time when you start it up it takes a while to fire up then it runs rough then it smooths itself out then when you give it gas it seems like it misses all the plugs that i took out all looked the same the engine was running the same im confused it seems like a fuel problem could it be old gass causeing this or bad injectors please help
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