This is not my personal vehicle, but I thought I would share. My current rental seems to be misfiring. I picked it up with 3,300 on the odometer, and now has 4,100. At first I thought someone put bad gas in it, but after two tanks of 87 E-0, it still misfires. No CEL. Is this common? I've rented '13 and '14 F-150s before, all with the 5.0L, but never a misfire.