My new Slant starts but wont stay running!

I need a check list
Here is where I am at

I just purchased the Duster with a 225 auto starts right up but wont stay running, the choke is in wide open position. I have tried it closed but its not cold here?

It is getting gas and when it fires no sputter it runs smooth for about 30 seconds then dies and it will then start right up again each time..
Help its my new daily driver.
Any ideas????