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Hi All, I had my brother-in-law take my Yukon back in and one of his mechanics spent the better part of a day on it. He ran tests on the different sensors, cleaned the throttle body and it still ran rough. He just happened to pull a spark plug the gap was off by double. Ended up there were...

Thanks Dave. I'll look into that. My brother-in-law ran some injection cleaner through it back in January. Not sure what he used, but he did it because the number 3 and 8 value were gummed up. But I also had the "Service Engine" light on so he knew the number 3 and 8 were gummed. Ran great...

Thanks for the response. I'll have my brother-in-law look at that. I thought I read some where that it might also be the O2 sensor? Do you know anything about that?

Hi All, I have a 2000 GMC Yukon SLT that I love to death. It has 75,000 and I am the second owner. I bought it in 2002 when it only had 16,000 miles and I knew the original owner. Anyway, lately it has been idling rough at stop lights when it's hot. I put it in netural and it idles just fine...