I have a toro mower that I have not used for 1 year and did not drain the gas out now when I go to start it it sounds like it attempts to come on but does not stay running.

Rem carb and clean all orifices with carb cleaner then use compressed air to dry. Old gas clogs up the carb also check your fuel solenoid for proper operation. Its installed at the bottom of the carb.

Also use fresh fuel.