while recently running my 8N it started acting up like it was running out of fuel. It was low so I added more fuel and it ran fine as usual. The next day it started acting the same way, shortly after start up acting like it was running out of fuel.
When it first starts acting up, if I slow the throttle speed it will straighten up for a minute or 2 and then starts spitting and sputtering again until it eventually dies.
I have checked the screens and even completely replaced the sediment bowl assembly but the problem is still there. It appears to be getting fuel as when I loosen the sediment bowl assembly or screw on the bottom of the carb I get gas.
Any suggestions?

When you look for fuel coming out of plug on bottom of fuel bowl, you need to time how long it takes to fill a pint bottle (typically ~ 2 minutes). If you just look for fuel, you may see that carb bowl has fuel, but it may have a restriction up stream. So when you start it, it runs until carb bowl is empty or too low to run, then when off, it very slowly re-fills.

Could be the tank vent is plugged. See the thread just below yours on the same topic!