Engine is knocking loudly, and truck is hesitant to drive on Ford Expedition

Average mileage: 157,371 (27,600–268,000)
Engines affected: 4.6L V8, 5.4L V8
3 model years affected: 1997, 2000, 2005
11 people reported this problem
3 people shared problem details
While driving for about 30 min, my engine began to knock loudly and began to experience and very rough idle. It is very hasitant to drive and comes really close to cutting off when I come to a complete stop. I check the engine oil and it is good. However, I did put about a quarter tank of 87 unleaded gas in there this morning from a low-priced gas station so maybe that has something to do with it.
2000 Ford Expedition- 4.6L V8188,000
Loud knocking sound from motor after spark plug changed. I had rough idle issues as well as hesitation and stalling out.still have problem
2000 Ford Expedition- 5.4L V895,000
Used 2 bottles of heat and drove around sloshing the fuel tank to mix the additive with the fuel. Took a couple days to clean up. Most likely water in fuel.
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