4.6 engine. Cylinders 3,4 and 5 are missfiring. Changed plugs and inspected rubber boot and no signs of rubber cracking. Maybe coils? How do you check the coils? Is there some kind of pick-up that tell the coil to fire?
well grease monkey way is get a screw driver stick it into the coil and lay it near a ground sorce and watch for a spark. or just switch the coil to a non missfiring one and check if it followed the coil or stayed in the same cylinder. Then go on from there
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