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Hello,
I have a Ford Focus St 2016, with a air intake from mishimoto, Cobb accessport and straight pipe. Yesterday I noticed that my air fuel ratio was really high when I was out throttle, it was going up to 43 -50 but when I was in idle and full throttle it was 14.7... Is this bad I have really low knowledge in the air fuel ratio I would like a little of help, if it is wrong what could it be the problem?
 

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You're fine. It leans way out when decelerating, as it's supposed to. As long as you're around 14.7 at idle/cruising at steady throttle input and richer than that when getting on it (lower numerically), you're good to go.
 

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