You can also pull the number 4 plug out. Once it's out stick it back in the plug wire, hold the wire at the base of the boot closest to the wire NOT the plug, ground the plug threads on a piece of metal (like the bracet on the back of the motor with the round cutout in it sticking straight up that's used to hoist the motor out) then have someone start the car. If the plug is firing fine you should get a nice bright white/bluish spark. If it's any other type of spark then you are not getting proper fire to it. I would say coil pack if that was the case because you know the ICM is sending signal to the pack itself.
Moving coil packs around just isn't as much fun as my way!!! LOL
My 2 cents.
