2003 Chevy Trailblazer Start Up Knock

2003 CHEVROLET TRAILBLAZER
137,000 MILES • 6 CYL • 4WD • AUTOMATIC
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RADOBX
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When i first start up from cold there will be a one time knock or bang like noise then truck idles and runs fine never any problem with idle or shifting into gears what could this knock be. Thanks
Aug 22, 2010 at 10:09 AM
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