In 2023 I bought a used 2009 Craftsman PYT9000 that has a B&S 24 hp 44M777 TYPE 0790 B1 CODE 091219YG. Ran great for 1.5 years. A few weeks ago, I started getting surging issues. From a cold start, it will run fine for about 20 minutes, then starts surging so bad that it shuts down. I have so...