Question about AFR

I haven't used my torque app in a while, and while using it before my AFR was always 14.7 while cruising and idling, but while taking a trip up north for Christmas I noticed my AFR was at 14.08. Nothing has changed other than time of year, from hot in the summer, to cold (well cold for Phoenix) in the winter now. I tried doing some searching but couldn't find a definitive answer, I think it is a safe ratio, just on the rich side. I was thinking maybe the MAF needs to be cleaned, I haven't picked any cleaner up yet but I plan on it tomorrow just in case. For the guys that know more than me, is this safe, is this normal, can it be fixed, could it possibly be the MAF, any other advice or thoughts?

Just FYI I do have a K&N intake and Flowmaster cat-back.


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