Help... Idle erratically and die
I am looking at problems with my Sammy's idling. The zuke idles up and down a couple of times and then eventually dies. When driving the truck bogs and gets power and bogs and gets power. This happens in every gear. I have looked at the electrical, coil good, battery good, cap good, wires good, new plugs. Looked at the fuel, pump good, lines seem to be good, filter repalced last year. I have looked at hte EGR valve, the PCV valve and look good. Timing belt not slipping, no vacume leaks that I can see or hear, caburetor sprayed and cleaned.
I have attached a pic of the front of my carb. The arrow points to a spring loaded lever that I have no idea what it does but if I push down on the lever the truck runs normally. Can anyone tell me whats going on?