i just installed a cold air intake from UPR. when i start the engine it has a unstable idle, thr rpm's go up and down. after i drive it for a while it returns mostly back to normal, keep in mind though its like 15 degrees in michigan where im driving it, is this normal? i have a 2004 GT mustang.

 

make sure nothing is leaking.... sometimes mine will pop off a pressed aluminum connection and it wont idle at all.... i have a densecharger tho, so its diff.... but def make sure nothing is leaking

 

sounds like the hose the goes to the air idle control is getting loose sometimes it is the on that goes to the side of ur plenium

 

maybe its not to big of a problem... maybe u should unplug your battery, reset the ECU, then plug the battery back up and wait a couple days and see what happens, it looks to me like a lot of these idling problems that people have with new TBs etc etc are only problems that go away within a week because the ECY just need to get used to it ... who knows though