Originally Posted by fury88
Hmm. Sounds like its not difficult but I'm new to some of the lingo.
did change my alternator myself and of course install CAI.
We've seen this symptom plenty of times with dirty throttle bodies on 05+ Mustangs, unfortunately. The fix can be as simple as putting the throttle body off and whipping it down with Brake Cleaner on both sides of the throttle blade. Typically, there's no need to take the drive-by-wire motor apart. Also, picking up some MAF cleaner and cleaning the MAF sensor isn't a bad idea either.
Give these few tricks a try and see how it goes. I'm confident the problem will be resolved after an Idle Relearn
. If it's not, we'll take the next step!