There was a TSB issued to dealers about a similar problem---don't know if it applies to your car or not, but have a look:
DRIVEABILITY SYMPTOMS WITHOUT DTCS OR
DRIVEABILITY SYMPTOMS WITH DTC P144A, P2196,
P2198, P1450, P0456-BUILT ON OR BEFORE
Some 2009-2011 Escape, Mariner, 2010-2011 Fusion and Milan vehicles equipped with a 2.5L or 3.OL engine built on or before 03/04/2011 may experience a leaking/stuck canister purge valve. This condition may cause various intermittent driveability symptoms without any diagnostic trouble codes (DTC). The condition may also cause driveability symptoms with malfunction indicator light on with DTCs P144A, P2196, P2198, P1450, or P0456.