At idle, give the fuel line a pinch for about 2-3 seconds, it should speed up and go back to normal, if you have to pinch it more than that time, it's too rich, turn the LSN in about 1/8-1/4 turn. If you pinch the line and it instantly speeds up and dies, it's too lean, enrichin it about 1/8-14 turn. Repeat test. It should hold an idle smoothly for at least 1-2 minutes before loading up with too much oil in the cylinder, it will stumble and then clear out, but return to a good idle and be fine. They all will run erratic if let to sit idling, it builds up oil in the cylinder and cools the element on the glow plug, causing misfires.