homelight supper 2 MN10696a SN H02111019?

I was gave the saw and i took and cleend it up it had dirt and rust all over it look like been sitting four years the gas tank was bone dry iput gas in it it fired right up and then thats when trouble started it will run with the choke wide open for about 5 min and dies choke it it will start agine will not stay running it has never ben took apart any help would gratley be appreciated