I have 2003 6s the other day it started misfire the other day. i pulled a plug it looked rough. so i replaced them. got every thing put back together miss fires bad idle high it throws p0300 and P0306. is there a way to bench test coils. thanks
i knowP0306 is misfire in cyl#6, far right, nearest to the water pump. you can bench test the coil like i did in the "that hesitation thing again(pg 14)" thread, but i still had a slight misfire because of a cracked coil housing. did go ahead and change all six plugs?
don't forget about how fragile our catalytic converters/exhaust manifolds are to misfires, especially the way you've described