Ok, if your sure it's not your transmission hunting for a gear at those speeds going up the Hills, it really sounds like a plug or coil pack issue. My guess is a spark plug issue since you say it's between those speeds going up hill would also make me believe your vehicle has shifted out of...
Well , if the belt is cracked or loose that will need changed. I know it seems weird the miss fire at 45 to 55 when it's warm, but that is not uncommon, I have 3 vehicles, two since new and I do maintenance probably to fault. But I have discovered tune ups are a big deal. Now with your year...
Our Expeditions cousin, the Lincoln Navigator has a cabin air filter under the glove box so the parts stores just probably assumed that the Expeditions has one also. Those sillies
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Also look for corrosion on the , solenoid and or starter connections. Also loose battery cables positive and or negative can cause this issue.
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