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Old 03-20-2009, 05:06 PM
  #16  
Scooterz
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Join Date: Mar 2006
Location: EUGENE,OR.
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If it is intermitent, I wonder if you are getting pre-ign from timing or bad vacumn advance... you might consider cross ign between plug wires or a simple ign issue as well that might create that knock at certain RPM.
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