Heavy Black Smut on Plugs
I have a 1986 V8 Buick with a new remanufactured four barrel carb. It ran great for about month and then the plugs had heavy black smut on them. It continue to do the sam about every two or three hundred miles with new plugs. I have not done anything to the carb. I only get around 8 to 9 miles per gallon. Everyone here has different opions, but none seems to fit. Looking for suggestion on what to do to resolve this issue.
Many thanks,
Neil
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