After replacing spark plugs why does it feel like my car is going to die at a stop

It's not normal for your engine to do this under any circumstances. I would focus on the possibility a vacuum hose or connection could be displaced maybe accidentally when replacing the plugs. Check for every hose and connection first. Then a diagnosis would have to be performed to see if there is a secondary issue.

I changed the Plugs in my 2011 Chevy Aveo , it Ran fine . I would check UR Cadillac Converter or Look for some other Problem that might be causing UR ISSUSE cause after changing plugs it should run fine .