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  1. P0300 Code. Help!

    I have a 2004 Trailblazer 4X4 4.2L. My starter went out. After replacing it, I got a bunch of weird codes like something was unplugged. It also had a misfire in cylinder 2. I replaced the coils and plugs, now I have random misfires. Anybody have a clue where I should start?
  2. '04 Trailblazer running sluggish all of the sudden

    OEM Issues
    Hello all, I have an '04 trailblazer with 4.2L. Within the past week it seems to run sluggish around 1500-2000 rpm, no power. If I give it more gas it'll down shift and power is back, seems normal at the higher rpms (almost like hitting the power band in a two stroke dirt bike). I have an...
  3. Texas say HOWDY!

    Im a new member from College Station Texas. I have a 2004 trailblazer LS 2WD. Good to be here!! Thanks for a great site for our problems!! I have two issues and they may be related. I have already done tons of work on my 04 trailblazer. My problem is, that she is starting to lag all the way...
  4. 04 Trailblazer 4.2L sluggish, irregular shifting

    Hey guys, I need some expert opinions on what has proven to be a hard issue to resolve. I bought a 2004 Trailblazer 4.2L about 2 months ago. About a week or so after I owned it, it started to seem quite sluggish to me, and it also shifted hard, especially in the lower gears. Then the check...
  5. Sluggish on mild load and sometimes rough Idle

    OEM Issues
    :bonk: I've searched the site extensively, Completed all suggestions/recommendations. Big issue is when driving under mild load conditions. i.e. cruise on flat roads, slight exceleration, or sometimes just idle, the TB has a sluggish feeling and a deffinate lug or vibration felt throughout...