Can the catalytic converter cause lose of power in my car

If it's clogged at all , yes. It can also cause overheating and poor fuel economy and poor running in general. IF you have the converter replaced , get the CAUSE of it's failure diagnosed and fixed , otherwise you'll be replacing it again , most likely.

my converter went took to my chev dealer and they said depending on your mileage there was a recall and they replaced it free of charge if your under 70000 miles it covered under chevy warrantee