I installed a brand new fuel tank and brand new fuel lines and still had the same problem when I tried to run it. I then ran it off of straight gas and oil mixed 40:1 and it ran much better just like it's been doing. Could it be the fuel? I would suspect it would be the glow fuel/methanol portion of the mix as it runs good with the gas and oil mixture and the gas is the same gas I use in my gas/glow mix. For the glow portion, I'm using 20/20 glow fuel cut in half with straight methanol. Then I use 1/3 of this mixed with 2/3 high test gas. It's getting frustrating to see it run pretty good on straight gas and oil and not run on the gas/glow mix. It's supposed to be the other way around. Any thoughts? Thanks.