I've never encountered this exact problem. I have a Chinese chainsaw in the repair shop, and the symptoms are as follows: It even starts sometimes and then immediately stalls. The chainsaw's basic parameters are fine. But there's a little trick I only noticed after thoroughly inspecting everything and discovering the problem! You can see which one in the video.
If you want to monetize your channel, join the affiliate program like I did: https://yoola.app/r/57365456704457