My Expedition would do the same thing if i washed it under the hood it was cuz i got water in between the coil and plug which made it short out all i had to do was let it air dry and it was fine the next day
It may be your MAF sensor i know when mine started goin out it would idle for a little bit but if i even gave a little gas it would kill itself IDK thats the best i got.
Holton, Indiana. New to Forum 2000 XLT 4.6L 4x4, notin special just a cold air intake, dual exhaust, a performance chip, little bit bigger tires and a bull bar.
I would say if it isn't your power steering pump whenever you turn the wheel, I would check your idler pulley that is what went out on my Expedition and it made a squeeling noise too.
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