2004 chevy avalanche

Check engine light on. After a long highway drive, white smoke pours out the next morning?


To add a bit of information. My first motor actually blew with this same problem. That started with a nmnr 2 cylinder misfire.had the fuel pump replaced recently because it took two cranks to start ,now starts well.

often a blowing head gasket, do this test https://www.youtube.com/watch?v=QA7KVQq9vKA&t=55s