What would cause the engine to run rough when idling?

2002 GMC YUKON
151,000 MILES
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OFFSHOREDAWG
  • MEMBER
  • 3 POSTS
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
Sep 28, 2011 at 5:57 AM
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DAN_K
  • ✓Experienced 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?
Sep 28, 2011 at 6:43 AM
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OFFSHOREDAWG
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  • 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
Sep 28, 2011 at 6:56 AM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,106 POSTS
Have you been able to resolve this issue OffshoreDawg?
Sep 29, 2011 at 4:48 PM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,106 POSTS
Check for vacuum leaks.
Sep 29, 2011 at 4:49 PM
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OFFSHOREDAWG
  • MEMBER
  • 3 POSTS
I am actually at work - offshore. I will check it out when I go home next week.
Sep 29, 2011 at 5:09 PM
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RIVERMIKERAT
  • ✓Experienced Mechanic
  • 6,106 POSTS
Ok. Let us know.
Sep 29, 2011 at 5:12 PM
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