580 Case SK Backhoe has got so it will only start with starting fluid and run if I keep the RPM's above 1000. It has always started first crank. Seems like fuel flow. Change filters? What could my problem be.

I have a 98 590super l it won't start cold without starting fluid after starting it will run 4-5min then act like its running out of fuel I will try cleaning the lines out hope it works tough having a machine I can't use I have a 98 590super l it won't start cold without starting fluid after starting it will run 4-5min then act like its running out of fuel I will try cleaning the lines out hope it works tough having a machine I can't use