You can check to see if it is the catalyst by having an exhaust shop do a back-pressure test or you can unbolt the catalyst pipe before you start the car to see if that fixes the issue. This problem can also be caused by low fuel pressure. Low fuel pressure is caused by a clogged in-tank strainer, clogged fuel filter, or a weak fuel pump. If the pressure is low the car would be running lean, which can also cause the engine to run hot. Another thing that can cause this problem is a weak ignition system, either from leaking spark plugs, carbon tracking on the distributor, or worn/improperly gapped spark plugs.
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