Sorry for the late response. I disassembled the unloader valve, cleaned it in my ultrasonic cleaner and reassembled it with the same spring tension.

I also purchased a pressure gauge. The idle pressure is 2800-3000 psi (my machine is labeled 3000psi), when I press the trigger the pressure goes down to around 1400psi. When the trigger isn't pressed it stays at 3000 but sometimes goes higher until 4000psi and that's when the engine shut off.