How to change spark plugs on a Chevy Trailblazer | GM Atlas 4200 Inline 6 cylinder spark plugs

My vehicle just hit 200,000 miles. That means its time to change the spark plugs. My vehicle is a 2007 Chevrolet Trailblazer. It has the 4.2L Inline 6 Cylinder Atlas Engine. The Iridium spark plugs are to be changed every 100,000 miles. This isn't a difficult job but does require removal of the airbox to get access to the coils and plugs. If you're needing to do this maintenance to your vehicle, don't be afraid to do it yourself. Take your time and you'll get it done.

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