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Start the car and go plug by plug on the coil pack and unplug them. The one that you unplug and it makes no difference in the idle of the car is the one that is bad. Try moving one of the other coils onto this spot and plug everything back and see if its the same plug giving you problems. This will rule out the coil pack being the problem if so.
If it is still the same cylinder pull the spark plug out and look at it and see if it is fouled. If its fouled you have a lot bigger problems then just a messed up coil pack.
If you have a haynes manual, it will tell you how to test the coil packs with a volt/ohm meter. My 3.8 went through a couple sets of wires and a couple coil packs before we just replaced everything with MSD stuff. 3.8s seem to eat some ignition products.
From my experience, a bad coil pack had the same symptoms as a burnt plug wire.
I still need to heat sheath my wires...
I had a bad coil pack with only 1 cylendar misfiring (cylendar 5) replaced it and fixed the problem...
Coming Soon - Firebird LS1 Swap with Boltons OR V6 2010 Camaro -- Your Final Day - You will watch your life flash before your eyes. Ask yourself, will it truly be something worth watching?