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Chevrolet
Trailblazer
Engine
Symptoms
Misfire
Random misfires
2004 CHEVROLET TRAILBLAZER
118,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
GRIVICCIO
MEMBER
1 POST
Car runs rough, check engine flashes. Changed plugs and one coil (originally said number five misfire) now says random misfires.
Feb 28, 2019 at 4:28 AM
ASEMASTER6371
✓
Experienced Mechanic
52,796 POSTS
Good afternoon,
Was the 305 and 300 the only codes?
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
I would start by checking the fuel pressure. Low pressure will cause this issue.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Roy
Feb 28, 2019 at 4:45 AM
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