They could try and say the relocated MAF sensor may be causing the issue. What kind of intake are you using? If it is one that keeps the maf in the same spot such as Steed a, Fswerks, or k&n should not be having issues unless there's a leak before the maf sensor.
old car 2014 Fiesta ST
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234 HP / 274 TQ
SCT Tune & Injen Intake, Borla Catback
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