The "Farm Boss" is an 029 -- or Model 29 -- depending what decade.
It's a "consumer saw," meaning there is a bit more plastic, and it's a
bit more clunky than a pro model.
But, it is actually a decent saw, and a pretty good workhorse around
the house -- or "farm."
As for your problem, I'd think I'd run a tank of non-ethanol premium
gas, with some Seafoam fuel treatment in it, just for the heck of it.
I have a suspicion that might help. It won't hurt.