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TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.

2002 trailblazer

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Old December 17th, 2012, 11:06 AM
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I have a 2002 Trailblazer that is running rough. So far I have replaced plugs and coil packs, map sensor, cat converter, and both O2 sensors. Still idles rough and acts like its missing. Any ideas what to check out next?
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Old December 18th, 2012, 10:31 PM
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When does it start to run rough?(during idle, low speeds, higher speeds)
Does it throw up any codes?
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Old December 19th, 2012, 7:40 AM
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Runs rough constantly but is more noticble at low rpm especially at stop lites etc. The service engine soon indicator flashes intermittently. Will be taking it to the shop tomorrow to check out what codes it may have.
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Old December 19th, 2012, 9:06 AM
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loose or broken vacuum hose causes rough idling, and is the easiest repair of all.
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