Don't dismiss the coil packs or wires yet. It's not unusual for the temperature or weather to effect either. Humidity and moisture can expose bad wires or coils that might not be seen on a dry day. But you're right that resetting the computer wouldn't change that. It would just be a coincidence.
Resetting the computer would cause a relearn of the throttle position and transmission shifting. Maybe the misfire was the TPS choking just a little too much air? I believe the reset would also clear stored data like the knock sensor. If the knock sensor was bad and telling the computer to change the timing, maybe that could cause a misfire.
