88 chevy bad catalytic

if a cat is that plugged you would have poor drivablity and if you punch it it would make a hissing noise out of exhaust is the codefor lean or rich exhaust what is the O2 sensor reading if you dont know take it some where to find out it will cost you less that throwing parts at it ie:just cus it has that code it is not always the sensors falt lick lean could be a vacuum leak, intake leak, ect.