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I asked our main tech here and he thinks the cats could be failing due to misfires. I know a few people who have had CELs due to misfire. I got it a couple of times also.
Maybe 10 years ago, wideband 02 controllers were VERY expensive. With new technology, etc. its failry inexpensive to have a good one installed. I use the AEM UEGO which is only a couple of hundred bucks on my car and customers cars. If you dont want to go that route, you can always go to a shop that has an eddy current dyno and have them monitor your afr under different loads. That should cost you about $100.
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