majbarron Posted September 30, 2011 Report Share Posted September 30, 2011 My 2005 devilles idleing high. I can start the car and wait a few minutes and it will normally drop down. Its not consistent at all. The codes that are current are IPC U1000, IPM B4019 and IPM B4029. Didnt look to me like these codes had anything to do with idle. Any suggestions. I have the same problem on my 1998 SLS. Comes and goes. Link to comment Share on other sites More sharing options...
Ranger Posted October 1, 2011 Report Share Posted October 1, 2011 When was the last time the TB was cleaned? Link to comment Share on other sites More sharing options...
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