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2005 chevy duramax wont rev past 3000 rpm

My buddy just bought a 2005 chevy silverado duramax dully. the truck dont seem to have the power it should climing hills plus it dont want to rev past 3000rpm. the truck only has 49,000 miles on it. the truck is all stock but came with a superchip power programmer that was not used yet.

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SOURCE: 2005 GMC sierra 2500 HD

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