Below is a diagram of the cylinder layout and the firing order.
The Coil pack is located on each Cylinders.
SOURCE: 1999 toyota avalon horn works intermitely
I would suggest to you to have the spiral cable (or 'clockspring') replaced. This is the electrical unit that transfers power to the air bag, the horn and the cruise control.
It is located right under the seering wheel.
Your description of the issue indicates to me that your spiral cable is loose, and making intermittant contact. If the vehicle had an air-bag deployment, this cable-device should have been changed.
I hope this helps. Take Care.
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