It knocked only when I used 87 ocatane. I tried the 93 to see if it would quit. So I am not sure what the problem is. There could me many things that have caused it. I used 87 first like the manual said.  
 
Thanks 
		
	
		
		
		
		
		
		
			
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				2001 Yellow GT 
Mods: A little of this, and a little of that.
			 
		
		
		
		
		
		
	
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