Backfires at idle every twenty seconds

1997 CHEVROLET SILVERADO
210,000 MILES • 5.0L • V8 • 4WD • AUTOMATIC
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HARDNARD3
  • MEMBER
  • 2 POSTS
My truck is the k1500 mocel. Sometime it backfires repeatedly. My truck starts up with great with no hesitation. It all started when I was on the highway and I accelerated to go around someone who was doing 30 mph and then it started to run rough, lack of power and backfiring. Please help I need my work truck.
Aug 14, 2019 at 11:23 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
HI,

Here is a guide that will walk you through the issue. Give this a read and let me know what you find. You can probably jump down to the repetitive backfire issue which is what you have.

https://www.2carpros.com/articles/engine-backfires-while-running
Aug 15, 2019 at 9:03 AM
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HARDNARD3
  • MEMBER
  • 2 POSTS
Okay, thanks. I will start this weekend checking those things out.
Aug 15, 2019 at 10:39 PM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
Okay. Great. Let us know what happens next week after you dig into it, or what you find if you fix it. Thanks
Aug 17, 2019 at 9:28 AM
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