Tory Bilt blower will not stay runnig

Have a Troy Bilt TB320BV. Wouldn't start. Replaced reed, diaphragm, and gaskets. Thoroughly cleaned carb (twice). Checked to make sure fuel lines are routed correctly. Now it will run for 4 -5 seconds then die. I'm thinking new carb, but wanted to give a shout out to see if there might be something I missed. Any ideas? Thanks!