i have a 1989 4x4 with a 3.0 v6 i changed the valve cover gaskets today and all of a sudden it was missing so i pulled the plug wires one by one while the truck was running to see if the idol droped it did except for one so i figured that the problem .spark is arching to thw wire the plug is good changed the plug wire and the same thing im kinda stummed

 

its the cyclinder closest to the front of the truck on the passangers side if that makes a differance