Sounds like a plugged cat? Can you remove it and wash it out to clean out the cones? Did that on my buddies V6 Impala.If the catalyst has stopped working, the front temperature will be about the same as or higher than the rear temperature.In a good catalytic converter, the rear of the converter will be 20+ degrees hotter than the front.From this site: https://axleaddict.com/auto-repair/How-to-Test-a-Bad-Catalytic-Converter#:~:text=If%20the%20catalyst%20has%20stopped,degrees%20hotter%20than%20the%20front.
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