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Another problem I had was the car would load up and cause sever missing. The plugs where as you have described wet and black. The original plugs were NGK 5671A-7 racing plugs. These plugs are to cold to stay clean if you are not racing. If you mainly just cruse with wide open throttle once in awhile than use NKG BKR5EY or Autolite 3924 which are two heat ranges hotter and self clean themselves reducing missing.
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