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2013 Mondeo Titanium X Sport Ecoboost
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The air/fuel ratio is monitored by the O2 sensor in the exhaust - since there is a direct corelation between oxygen in exhaust gases and the oxygen available for combustion - so this is how the vehicle measures it.
As it's intermittent, it's going to be a challenge to pin it down, but there are a few checks you can do to rule some things out.
I'd have a look at the O2 sensor. Check the wiring and maybe think about taking the sensor out and giving it a clean.
 
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