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  1. The 02-09 "How-To" and DIY Section
    I have a 03 Trailblazer LTZ I6 with 150 000 miles on it. I previously had issues with misfires so I replaced the spark plugs and all ignition coils at 140 000 miles. Everything was fine until a couple of days ago. I can now feel again that one cylinder is sometimes having a misfire. The OBD2...
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