Average mileage: 165,860 (27,600–268,000)
Engines affected: 4.6L V8, 5.4L V8
14 people reported this problem
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.