2003 yukon won't idle

[rthomp]

Hello,

I have a 2003 Yukon 5.3 liter w/112,000 miles. I just replaced the Knock Sensors, Knock Sensor Harness and Intake & TB gaskets and after checking 4 times I'm pretty sure I have put all the wiring and hoses back where they belong. The problem now is after it warms up it wont idle. It seems to run ok while its warming up but after that if your setting still it starts to lope then dies. It will start right up then do the same thing. No Codes. If this was an old carbureted engine I would think it was a vacuum leak.
Anyone have any ideas?

Thanks,

---------- Post added at 11:02 AM ---------- Previous post was at 10:26 AM ----------

Just checked for vacuum leaks and she's tight. Noticed that she's not loping so bad and its idling longer before it dies. Could it be the computer resetting itself?

 

[ccapehartusarmyINF.(ret)]

do you have an aftermarket intake an filter or the factory one
because while the vehicle is warming up its in openloop wich it ignores the 02 sensors and runs a rich mix till its warm and it sounds like when it goes into closed loop yer mix is way to lean wich is usually caused by aftermarket cold air intake s

 

[rthomp]

I took it out for another drive and it seems to have corrected itself. Idles fine now. It seems a little low on power but I don't drive it too often. (Wife's car) I talked to a service tech at the local dealer and he told me that it could be the computer was resting the idle since the Battery was disconnected for so long.

Thanks for the help!