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What would cause the engine to run rough when idling?

Tiny
OFFSHOREDAWG
  • MEMBER
  • 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
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Wednesday, September 28th, 2011 AT 12:57 PM

6 Replies

Tiny
DAN_K
  • MECHANIC
  • 213 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
  • 3 POSTS
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
  • MECHANIC
  • 6,110 POSTS
Have you been able to resolve this issue OffshoreDawg?
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Thursday, September 29th, 2011 AT 11:48 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Check for vacuum leaks.
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Thursday, September 29th, 2011 AT 11:49 PM
Tiny
OFFSHOREDAWG
  • MEMBER
  • 3 POSTS
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
  • MECHANIC
  • 6,110 POSTS
Ok. Let us know.
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Friday, September 30th, 2011 AT 12:12 AM

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