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Hello, i have problem with my Ecoboost facelifting. On gauge AFR is constant 14,0. I changed lowside fuel pressure sensor, high pressure sensor and still nothing. I have a problem with the fuel pressure, it even jumps at idle. I also replaced the pump in the tank
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Maybe it has something to do with the CEL that's illuminated, have you pulled codes?

Do you have a tune in the car or is it stock?
 

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2017 PP MT DD
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So it jumps around? If thats the case it's suppose to. Your never going to get perfect combustion every time. I can't remember what the ratios are but they are different for economical as apposed to if you are demanding power.

The gauge has a bit of lag but should show highs and lows during WOT and foot off pedal coasting.
 
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Do you have a P0496 code by any chance ?

Get a OBD2 scanner and check what kind of check engine light code you have, whatever it may show, could be related to the issue
 
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