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Sputtering only while driving

Tiny
MICHALE FASTHORSE
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • 215,670 MILES
I was driving down the highway then my SUV started to lose power and sputter but idled just fine in park.
Saturday, May 2nd, 2020 AT 6:32 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

It sounds like you have a misfire under load.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

How long since you replaced the plugs? It could be a spark plug breaking sown under a load.

Is the check engine light on? If it is, do you know the code? You can have the codes read for free at a parts store.

Roy

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Saturday, May 2nd, 2020 AT 7:38 AM
Tiny
MICHALE FASTHORSE
  • MEMBER
  • 2 POSTS
I changed the spark plug wires and spark plugs last August and no check engine light.
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Saturday, May 2nd, 2020 AT 2:43 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay that was last August and this is now. Any one of the plugs could be breaking down under a load. I would not assume anything at this point.

I would also check the fuel pressure as well.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy

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Saturday, May 2nd, 2020 AT 3:01 PM

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