my 1994 explorer with a 4.0 motor sometimes runs on 5 cyl and sometimes on 6cyl on 1994 Ford Explorer

have changed plugs, plug wires,fuel filter,injectors,lower intake gasgets,coil seems to be good,when it runs on 6 cyl, runs good then will start running on 5 cyl,and sometimes back and forth, any ideas

by in Foxboro, WI on January 19, 2012
1 answer
ANSWER by on January 20, 2012
how many miles on car and how is your wiring to coils? word has a wiggle test for wiring harness problems. so try to duplicate the misfire by wiggling diff wire harnesses. its intermitant so you may have a corrided wire or connector