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Thanks for responding. The O2 sensors showed good when this started - only after about 6 weeks of fooling with this did they come up bad (confirmed by having 3 different shops testing !) I also tried the turn-on-and-wait trick, but did not seem to make any difference. Will replace the sensors...

Hi There. I am a new member to any discussion group so if I do something wrong please let me know ! I have a 1999 Yukon SLT 4WD with 230,000 miles on the clock. I have had it since it had about 45,000 so I know its history.The recent problem is this: if it sits more than overnight it becomes...