First off the cat converter is never the CAUSE of a problem. It fails because of a problem upstream. When an engine misfires, all the unburned fuel goes into the cat. The cat is designed to handle a certain amount of unburned fuel. But when it is too much, the reaction really heats up -- to over 2,500 degrees. That melts the metals in the cat. These coils are known for misfire failures. I know techs that have had to replace 4 or 5 coils on a single vehicle to get it running right. First eliminate the misfires. Then take on the cat. Not the reverse.
As for the manual, be a sport and drop $10 on a 1-week subscription to www.eautorepair.com
It's the only way to get reliable information. Or, if you want another online source, try ALLDATA - OEM Automotive Repair Information and Technical Service Bulletins