Question about 2003 Chevrolet TrailBlazer

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03 chevy trailblazer

I have an 03 trailblazer and we have just replaced 4 coil packs, and also a cam position sensor. When I start it in the morning it runs extremely rough. It sounds like a cylinder is misfiring. Upon take off it has no power and will stall out it was mostly doing this when I turned a corner but it is happeing more often. It usually runs fine after it has been running for a bit. However, it did sit for about 7 hours at my work and even though it had been run in the morning it ran rough and was under power and stalled on me. Any ideas???

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  • 1,195 Answers

IF there are no CEL's, remove fuses #10 and #28. Remove your throttle body and clean it with sensor safe spray like Seafoam. Can reuse the plastic O-ring. After clean, reinstall fuses and drive around for several miles so the computer can relearn.

Posted on May 05, 2017


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Posted on Jan 02, 2017

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SOURCE: engine stalls

your on the right route but also check egr valve

Posted on Jul 07, 2008

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SOURCE: 2005 chevy colorado runs rough and gets bad gas mileage.

Sounds like it needs spark plugs and wires, and a fuel system treatment.

Posted on Oct 08, 2008

  • 58 Answers


The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

Posted on Mar 21, 2009

  • 6927 Answers

SOURCE: 2003 kia # 3 misfire/ runs rough

Replace the coil for number 3 cylinder.

Posted on Nov 11, 2009

  • 12 Answers

SOURCE: 99 chevy silverado running rough and stalling.

the problem you are discribing would lead me to belive your fuel filter is clogged which is a simple fix 3 dollar part at any part store or on the worse hand your fuel pump itself could be weak you can open the gas tank cover and have another person turn the truck key to the on position without going far enough to start you will hear a faint whining noise if it is going bad or a louder noise if it is fine Good Luck

Posted on Mar 03, 2010

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The car is running on 2 cylinder,

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