I just bought a used 2008 Chevy Trailblazer with the 4.2 6 cylinder engine. I was showing it to a guy friend of mine and he was looking under the hood and said i had a problem! He said that there is a hose clamp missing from the air intake towards the air filter box. It has a clamp on the engine side of the hose but not the other end, I looked at it and to me it looks like it is made that way as the other end of the hose has these little things sticking up all around it so a clamp won't fit anyway . Please look at your engine and see if it looks like mine, and if posible post a link to a picture of your engine, thanks.
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