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  1. OEM Issues
    Last Friday, I was driving home from work when my 04 Trailblazer threw a check engine light and started misfiring, I figured I just needed to replace my spark plugs which I planned on doing over the weekend anyways. It progressively got worse as I was on my way home. Next day after work I was...
  2. 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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