We have a 2019 Thor z28 with the Ford f450 10 cyclinder. We keep getting check engine light and reading shows mis fires of cyclinders #2 and #9. In garage twice and mechanics can find nothing wrong. Anybody have this problem?
I'll add plug wires to Taylorbob's list. Things get pretty tight and hot under the E450 hood and one or two wires could be "induction firing" under load. One question however, independent garage or Ford dealership garage?
A Ford dealer would be able to hook the computer to the OBD II port and drive it to duplicate the problem and get a real idea of what the trouble is. This should be under warranty, stay on them to find it.
2016 Tiffin 40QBH
2005 36TK3--retired, but it was a good one
2017 F450 KR