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2002 2003 2004 2006 2007 4.2 4wd 4x4 a/c abs actuator air conditioning air suspension alternator amp arnott audio battery black bose brakes check engine light clean coolant custom differential electrical engine envoy exhaust ext fan clutch fuel fuel pump fuse gas gmc grille headlight headlights hid hids hvac idle ignition ignition switch install interior introduction leak led lift lift kit lifted lights misfire mod mods no start noise oem offroad oil olds bravada oldsmobile bravada p0300 paint pcm power steering radio rear reduced engine power replace rims rough idle sensor shocks speakers ss stalling starter stereo struts subwoofer suspension swap switch tbss tccm throttle body tires trailblazer transfer case transmission transmission problems vibration water pump wheels wiring xuv
  1. Engine Tunes/Mods
    I have a 2003 Trailblazer with a 4.2L 4X4. Bought her back 2 years ago now. Since then I've replaced many of parts. I got it with 238k and its sitting on 263k miles. Within those miles I've replaced; power steering pump, fuel filter, fuel pump assembly, spark plugs, suspension components, lift...
    engine performance vvt
  2. PCM of NC
    [Updated] PCMforLess Review Overview Alright after a few days of testing I've assessed the PCMforLess tune. I am very pleased. This truly does "wake up the engine". Totally worth the money. I chose the Core program. I however decided to keep the old PCM for that "just in case situation"...
    engine performance pcm pcmforless tune
  3. General
    I took my 04 TB into the shop because the battery would go dead if not driven for a couple of days. Prior to this, I was experiencing some performance issues (rough idle, lower fuel mileage, shifting at higher RPM in low gears, etc). I think the battery might have had a bad cell (brand new 6...
    battery engine performance fuel mileage rough idle shifting
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