Question about 2002 GMC Sierra 2500HD

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Strange noise! My 2002 GMC Sierra 2500 HD make a funny sound every time the throttle is engaged. It almost sounds like an exhaust leak emitting from the front of the vehicle but I can't seem to find anything wrong! Am I looking in the wrong spot or even for the wrong problem?

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My 2005 GMC 2500HD (8.1 lt) had the same problem. I just had an exhaust leak fixed today. The right front manifold bolts were broken and the manifold was warped. The repair was 6.5 hours labour plus gaskets, seals, bolts and the manifold machining (parts were $130 CDN).

Posted on Sep 11, 2008

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