Kinda noob air fuel question
 

OK so I am running BP single turbo kit and have had it installed for about 1200 miles now. Once I got it tuned, my air/fuel at idle and during normal acceleration ranges between 14.5 to 15. Today driving to work everything was normal. I just got done driving to the bank and at idle it was around 15.5-16.
Is this something to worry about?

one at a time people i can't handle all these responses

Was there a temperature change outside? Does the car seem to run any differently? You say it changed at idle, did it change under cruising or WOT at all?

There are many many many causes of this so its best to narrow it all down.

Was it still running leaner when you started it the next time?

no next time i drove it the a/f was normal. it was hotter than usual that day if that could be a possible cause

If all is normal now, and it was just a one time thing I would not worry.

^^THIS^^

If it's normal now it was probably just a hiccup. Watch them for awhile. It's possible you have a fuel trim O2 sensor starting on it's way out but I wouldn't worry unless it repeats itself.

I'm curious what to do if it happens again. Stay out of boost? Turn it off immediately?

Pull over in a safe area and stay out of boost, restart the car and see what happens, let it idle maybe and see if it sorts itself out. Then start checking sensors