Can you verify the float levels are at their correct height, if they are too low or inconsistent on all 3 carbs, it can starve the engine for fuel as well.
Good call CNC-Dude and I have. Matter of fact when I put the .080" jets in, the front carb was maybe a tad too high as when I pulled the air horn the fuel was way up in the bowl...like to the top.
The other thing I checked was making sure the power valve assemblies weren't jammed or stuck like they can sometimes get. I guess my "checking" them all I did was push the plunger with a small screw driver to make sure they sprung back. Not sure if there is a better, more precise way to check that assembly.
