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sanacm 08-08-2009, 09:39 PM I want to replace the spark plugs on my 03 Trailblazer. I have the 4.2L 6-cylinder engine with 65K miles. What do I have to remove to access them? Jethro 08-08-2009, 09:53 PM you wont find a v6 in any trailblazer built after 2001 sanacm 08-08-2009, 10:51 PM you wont find a v6 in any trailblazer built after 2001 You are correct. It is the L6 4.2L engine. GMMerlin 08-09-2009, 05:55 AM Remove the coil and then remove the plug..pretty straightforward operation Automotive Network, Inc., Copyright ©2013
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