Random misfires

Tiny
GRIVICCIO
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 118,000 MILES
Car runs rough, check engine flashes. Changed plugs and one coil (originally said number five misfire) now says random misfires.
Thursday, February 28th, 2019 AT 12:28 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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
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Thursday, February 28th, 2019 AT 12:45 PM

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