64 IIA hesitating, sputtering, and bucking under load

[LndRvr64]

Thanks all. I am thinking it must be crud in the tank, as it had been running normally until it got down to 1/4 tank. Filled it up and cleaned the Solex again and it is running OK again. Maybe I will try some magnets. Tank was swapped about 15 years ago, so I didn't think it would build sludge up yet, but it did sit for about 45 days as it shipped to Hawaii, so that may be it. Or maybe it is missing winter.
Jack