still no go

Tonight, I addressed the water leak and topped off the fluids. Then Adam came over and we fired her up. The car was all good from leaks: air(vacuum), water, or oil. Good. We adjusted the idle air control valve and got the car's down to ~750rpm idle. All seemed good. However, the motor was still a little shaky at idle and it was still running rich. With a little throttle, it sounded like a lawn mower.
We checked the spark plugs and they were pretty charred. We did a check with the motor on and pulled each coilpack thinking that possible one of the coilpacks weren't working and not sending a spark to the spark plugs. If the motor got worse, then that coilpack was ok. Cylinder 1, 2, and 4 all got worse when the coilpacks were pulled and no change when cylinder 3 was pulled. This ment 1 of 2 things- either the coilpack was bad, or there is something wrong with the cylinder. we switched the coilpacks 1 and 3 and repeated the test of pulling the coilpacks with the motor on. Again, cylinder 3 was the only one with no change in the motor idle when the coilpack was pulled. This ment that the coilpacks were fine and that there is something wrong with cylinder 3.
Game over for the night.
What I need to do tomorrow is to do a compression check and buy new spark plugs. Hopefully we get similar readings in each compression and after changing out the spark plugs, the car is running correctly.
It just seems like if it's not one thing, then it's something else.