ok i am a young tech at a big ford dealership in kansas and i have seen this problem once or twice. i would start with going back to the motorcraft spark plugs you know thats what the motor likes for sure and the second thing is the K&N filters have a oil on them that are bad on the hotwire of the MAF ( mass air flow) and the AIT( air intake temp) this can cause your motor to be reading a warmer air intake temp because the oil on the hotwire will retain the heat from the hotwire and the thermistor of the AIT I hope this helps with the problem keep us updated
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