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It sounds like you have an ignition misfire. Spark plugs very common on these for misfires. I would have the spark plugs replaced and then reevaluate concern.
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OK then. Just fyi, these plugs rarely code or turn on engine lights. They also only break down and misfire under load. They never misfire at idle or on normal acceleration. They usually misfire the most when trying to maintain speed or on very light tip in acceleration without a downshift occurring (greatest engine load). Just my 2 cents, I replace 3-4 sets of spark plugs per week for this concern with this engine in the Expedition, F150 and Navigator.
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