Why won't my weed whacker keep running?
It doesn't take bad gas or ethanol to crud up tiny carb jets and orifices. Any gas gets old and any gas dries into varnish over time, especially that which has been mixed with two-stroke oil. Proper storage is critical.

Seek out an exploded diagram or a how-to and disassemble your carb. Make note of all screw settings (count turns to fully seated) and take some phone pics and clean everything thoroughly with solvent. It'll run better than new.