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2002 Chevy Trailblazer Ext
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Discussion Starter #1
2002 Trailblazer Ext 4.2L I6

Ok so here's the deal. I've had a new remanufactured engine in for about a year and it's been running great. Untill recent electrical issues, it boiled down to a bad pcm. So, I just recently had a new PCM installed by the dealer. When I got it back I was having a missfire issue. I've been pulling out my hair trying to fix this...
Things That have been done:
  • New Ac Delco plugs
  • New Coil Packs
  • New fule injectors and fule filter
  • New battery
  • checked for vacuum leaks none found
Many other parts have been replaced that wouldn't pertain to this issue.
So what am I missing... The misfire usually shows the P0300 but occasionally I get it narrowed down to a P0301 or P0304
The dealer told me I needed to drive it and it would clear up but it's been near 500 miles now, it's got to be another issue... I'm really trying not to have to go back to the dealer or mechanic...

Any thoughts??? Thanks for your input in advance...
 

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2003 chevy trailblazer_ltz
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137 Posts
I get it narrowed down to a P0301 or P0304
The dealer told me I needed to drive it and it would clear up
The dealer avoided having to fix the issue, and got you out of their hair. You allowed this.

Go back, and demand they make it right.
 
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