I am betting its your fuel. Are you running regular gas? How old is your fuel? How old was the oil you put in the mix?
1. Pour the gas in the tank into a clear container (I use an old plastic peanut butter jar at work. The large mouth makes it easy to catch most of the fuel from the saw"s tank.) See if any water settles out of it. If you do, it is the ethanol in the fuel. That is called "phase separation" It is very bad for the saw as the oil won"t mix with the alcohol in the water. So not only is she lean, she"s running dry with no lubrication, too.
2. Check the little screen in the carburetor where the fuel goes in. It may be clogged.
3. Replace the fuel filter.
4. The fourth thought is the little hose between the carburetor and the cylinder is not sealing and that is causing a lean run because the carburetor is not getting enough pulse from the engine to work the diaphragms. I do not know if the 372 has this hose or not though.
5. Your saw has an air leak that only manifests itself when it is hot. Probably at one of the crankshaft seals.
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