What would be signs of a catalyic converter going bad on a 1995 chevrolet blazer on 1995 Chevrolet Blazer

My blazer is running real bad and my brake pedal is hard,and I can not find a vaccum leak

Asked by for the 1995 Chevrolet Blazer
Do you have any check engine codes? Usual signs for a plugged cat. converter is poor idling and the vechicle will bog down on moderate to hard acceleration. Lack of power going up inclines in the road. You can get engine codes from o2 sensors and cat o2 sensors as well as egr codes. Does any of these sound familiar.