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2006 Siverado 2500 4wd 6.6 turbo. Lost throttle response on freeway. Lots of soot. Above 2500 rpm engine not responsive. checked under hood and could hear whining bearing noise like alt or idler bearing going out. Fuel pump?
 

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IS it a whining noise or a boost leak? Are any mods been done to the truck is it stock or tuned?
 

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Can you hear the whining noise at idle or is it only present as boost builds?
 
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