Now that Im thinking more about it, it used to run clean throughout the range. I changed the fuel lines at one point to a type that fit tighter on the nipples and maybe its just enough smaller diameter to make a difference of how much fuel its getting. Maybe it needs more flow at that range and it isnt getting it?
I have to go out of town for a week and when I get back Im gonna change back to the other fuel line and see if that makes the difference.