Start and runs ok, until it warms up. then it loses power and runs very rough, and stalls out. I have a feeling that it may be the screw settings on the carb, but don't kow what to set them at so haven't touched them yet. Does anyone know how to set the carb, or have any other theries to my problem?

Garden - Tecumseh - Snowblower Snow Blower Starter Handle (Tecumseh)