Are you sure the distriburator isn't a tooth off? I remember once a friend of mine brought me his car confused as to why his rpms were jumping around and the car sputtered and sure enough when I went to check the distriburator it was off. He had taken it out for a cam change. After a the timing was set it worked correctly.
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67' Fastback-Mean Temper
67' Coupe Under Construction
70' Torino Cruiser
84' Svo Original
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