I just had a one year old 441 from a place I work (part time) in for the same reason, and it turned out to be a plugged fuel filter.
The dealer replaced the carb solonoid, spark plug, decomp valve, and "couldn't get it recalibrated". so said they couldn't fix it... shop was all warranty work, no money traded hands. I took it home & went through it.
I replaced the fuel filter, recalibrated it (let it idle in the low choke/start position for 90 sec) and I noodled a truck load worth of big rounds into blocks today.
I don't know which of those fixed it, but it would start hard & Idle Ok-ish before this, but as soon as I started cutting it would lose power & die.
It's had a rough go, the guy before me considered it a big saw & I don't think he ever sharpened it judging from the chains on the wall...
He also used it to "cut" thousands of feet worth of slots in the dirt & across gravel driveways for electrical wires, which he would poke wires in with a yard stick.
Some of this might be worth a try.