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#1
04-02-2006, 07:35 PM
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Spark Knock 99 Yukon 5.7
Man what can I do to stop the spark knock at speeds from 35 mph and up tryed the 93 gas $$$$$ it slowed the knocking down a little.Sprayed carb. cleaner still no results it idles great so so gas millage 12 in town 16.8 hwy.
any help would be great and it has 84000 miles on it if that will help 
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