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HybridZ

Fouled plug


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My 77 z keeps fouling plug #6. I take it out clean it and it runs good. After a couple of weeks it does it again. It feels like #6 just shuts down. When I pulled the plug it looked wet. It appears to be gas fouled. Spark cheks out OK. Can it be that the injector is open all the time?

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Well, I replaced all spark plugs and used the car for a couple of days. I just removed the new plugs and they are covered by a loose black carbon like soot. I'm thinking too much fuel or retarded timing. How do I know if the plugs heat range is the correct one. How can I adjust a/f mix.

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