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Miss at idle

Tiny
JODA
  • MEMBER
  • 1995 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
Hi, my truck has a bad miss at idle runs good at higher speeds. I replaced the EGR and the distributor and coil with new ones. I also have installed a throttle body spacer by hyper tech. Also replaced the master brake booster and fluid container.
thank you any help will be greatly appreciated.
Joe
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Saturday, October 26th, 2019 AT 12:14 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

When did this misfire start? Was it after the throttle body spacer? Also, what is the truck idling at? If you added a spacer, you may need to reset your IAC.

Lastly do you have a check engine light? How do you know this is a misfire and not a vacuum leak/rough idle? Do we know which cylinder is misfiring?

Here is a guide that goes over misfires at idle. Attached is a bunch of info about IAC and testing for rough or unstable idle.

https://www.2carpros.com/articles/engine-vibration-at-idle

Let me know what you find and we can go from there. Thanks
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Sunday, October 27th, 2019 AT 3:55 PM

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