OK so I have a 1999 oldsmobile silhouette that is stalling out and blo

Worst car guy ever

OK so I have a 1999 oldsmobile silhouette that is stalling out and blowing white smoke from the tailpipe and I have changed the water pump thermostat and heater hoses and now it is over heating again and I am trying to find out what is going on with it if you are able to help me out with this it would be greatly helpful