Snow blower starts than it dies out I changed the spark plug new gas don't know whats the problem

I suspect the carburetor needs cleaning. Gas nowadays is terrible on equipment that sits for long periods of time (like a snow blower) without being used. The gas nowadays goes stale very quickly and gums up the carburetor. To prevent these issues use a gas stabilizer. I have stabilizer in all my jerry cans of gas. That way everything I fill up is ready to be stored at any time.
I'll give you an example of how bad the gas is.... My neighbour bought a new lawn mower. Selling feature of the mower was "guaranteed to start first or second pull". The next year it wasn't starting properly so he took it back. He was told he didn't store the mower properly over the winter (He didn't use a gas stabilizer) so no warranty. Took the carb apart and cleaned it ran like a champ....