i have a 2000 navigator and check engine light came on so got it checked end up being code p0308 8th cyclder misfiren so brought it to the shop had the coil plus plug changed drove 20 mins up street light came on again brought it back guy changed it just to make sure it wasnt something he did this time two days later light came back on put it back on machine still reading nunber 8 misfiren what do i do
8th cylder is misfiren on 2000 Lincoln Navigator
You could have a fuel injector issue, or a base engine issue. You need to have a compression check done, with a cylinder leak down test. If that all passes, and you are certain your coil and plug is ok, you need to pursue your fuel injection system.