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If there's no power loss while accelerating, 99.9% guaranteed not to be the cat. converter. I'd start with the ignition module. When they go bad they can, almost always, still work properly when they're cold but then fail after they warm up, and it's because of this fact that when you have it tested, it needs to be tested 4-5 times in a row. This constant testing will bring it up to the temp where it would fail. Even a bad module will pass the first couple tests.
There are a number of things that come to mind. Has the fuel system, and ignition system been serviced lately? Is the service engine light on or come on at any time lately? Spark plug and spark plug wire condition can causes hesitations as well as dirty air and fuel systems. Let me know if any parts have been changed in the past year and how long ago did it start. What engine do you have and how many miles. Let me know. Regards,