Hey I have a problem with check engine light code says # 1 cyl misfire. I pulled plug it looked wet n fouled replaced it and it ran fine 3 days, now back doing same thing again. Any suggestions, I am replacing the coil pack n wires, also the plugs. I am not familiar with this engine so I thought I would ask, 2000 ranger 4.0 4X4 only mods are air filter n chip