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2005 chevy trailblazer_ls_ext
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http://www.youtube.com/watch?v=IhBebL0JeAs

A quick simple explanation of how to change spark plugs in a 2005 or later Chevrolet Trailblazer.

You don't need to be super handy to do this, and it will save you money!

* The only slightly difficult part is the removing the wire harness to get at the forward most spark plug. You just have to twist the white plastic piece so it slides into the black square hole and it will twist itself out. Then, you can remove the entire white piece by unscrewing it after the harness has been removed.
 
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