Not necessarily in the tune, but it is one thing to rule out. Tune files can get corrupted. I would guess there would be a DTC set if the idle was higher than what the ECM was commanding.
http://content.efilive.com/documents...nd%20Users.pdf

 

What temperature thermostat?

 

Stock t-sat replaced with same ac delco stat .... IIRC 195* but what ever it was originally

 

I would also do a smoke test when the engine is cold to see if you have a vacuum leak that shows up while engine is cold but seals as engine gets warm. I had a problem like this once when my battery went dead while cranking. When I charged battery truck idled high until I shut off engine and disconnected battery for a minute. When I reconnected battery everything worked good again.

 

put on stock CAI,then stock stat,then stock tune.Im betting its the airjr,i hate the one i had on 010

 

You may be right. BUT. It has stick stat and this a new pblm. Did not do this 1st 2 winters. Same tune same CAI

I have been watching my intake air temps on in cab scan gage and does not seem to matter what they are. In below 0 weather coolant temp has to be above 190 and at that temp for at least 20 minutes be idle speed come right down to stock 525 rpm. On cold start it will fast idle about 1000 rpm til temp up ti about 120 then it drops to 700 then ot wont drop tp 525 til the 190 plus. When warmer out day 10* it only needs to ho up yo 170 to drop to 525 ???

In full warm weather. It operates as normal. Goes 525 after 143 as per the factory setting

 

years ago i had an issue with my vortec max in cold weather it would idle low and die once in a awhile fully warmed. front o2s were in a place were two header pipes came together,moved them a little lower down stream where all 4 pipes came together,it wasnt getting hot enough was the problem,moving them fixed it.

 

UPDATE ........ installed stock tune ..........no change really did not expect it to solve as this was not a problem when tune first installed ........... at this point assume it a MAF /AIT or TPS issue ........ one thing I have found in cold weather even with coolant temp at 194 it still fast idles until truck at that temp for 20-30 minutes before it comes down .............but if I turn ignition off for 10 sec or so and restart it idles right down like normal

 

Check all the seals on the CAI, had my air raid jr pop off on my 2011 when it was cold a couple of times. That plastic can shrink/expand a good but with temps. It could be loosening up just enough when cold to let air seep in and confuse the ECM.

 

I would think this problem has to be post TB in order to cause some sort of idle run away unless it is simply a sensor. I would also think if its a problem with a sensor there would be other symptoms. The intake air temp should not have an effect on the commanded idle speed. Can you log commanded idle speed?

I may be stating the obvious here but I would guess the car is commanding high idle, rather than having something cause a higher idle than commanded. In my mind that rules out a faulty intake or even a vacuum leak. It was my understanding that commanded idle speed is controlled purely by engine coolant temp... i guess thats what we need to get to the bottom of. Are there multiple engine coolant temp sensors? Another interesting point is that at a lower ECT the tune should also add a small amount of timing... I wonder if that is happening as well.