Take that carb completely apart and blow out all of the passages, ALL OF THEM Measure the size of the needles and seats, if they are smaller than .110 (the opening in the seats) replace them with bigger needles and seats Fuel delivery problems can and will drive you(and me) nuts After reading all of this post it reminds me of a problem I had with fuel delivery on one of my first car hauling trucks, it had crap packed up inside the fuel lines and fuel valve for switching tanks That problem almost drove me nuts back then Once you find these types of problem you learn what your made out of, you then know you can fix almost any thing Stick with this one, your going to figure it out