WHAT WOULD CAUSE THE ENGINE TO RUN ROUGH WHEN IDLING?

  • Tiny
  • OffshoreDawg
  • 2002 GMC Yukon
  • 151,000 miles

There are times when it sounds and acts like it is going to die. The RPM's drop off and then come back up to normal operating range. Sometimes, it doesn't run rough. I thought it might have been bad spark plugs, so they were changed out. Could it be a bad spark plug wire or dirty fuel injectors?

Thanks,
Allen

Wednesday, September 28th, 2011 AT 12:57 PM

6 Answers

  • Tiny
  • Dan_K
  • Expert
  • 222 posts

Is the "check engine" light on? Are there any diagnostic trouble codes (DTCs)? If you haven't changed the spark plug wires in a while, it's not a bad idea to put a new set on. When was the last time the fuel filter was changed?

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Wednesday, September 28th, 2011 AT 1:43 PM
  • Tiny
  • OffshoreDawg
  • Member

There aren't any check engine lights on. I will change the spark plug wires and the fuel filter and see what happens.

Thanks

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Wednesday, September 28th, 2011 AT 1:56 PM
  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

Have you been able to resolve this issue OffshoreDawg?

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Thursday, September 29th, 2011 AT 11:48 PM
  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

Check for vacuum leaks.

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Thursday, September 29th, 2011 AT 11:49 PM
  • Tiny
  • OffshoreDawg
  • Member

I am actually at work - offshore. I will check it out when I go home next week.

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Friday, September 30th, 2011 AT 12:09 AM
  • Tiny
  • rivermikerat
  • Expert
  • 6,155 posts

Ok. Let us know.

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Friday, September 30th, 2011 AT 12:12 AM

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