Sounds like you may have a vacuum leak. Does it stall out if you run it sideways then again level (felling then bucking)?
Did it sit a long time? What did you do to it when you got it? When was the last time the carb was rebuilt? If it indeed an older Homelite it probably has a Tillotson HL series carb - very easy to rebuild.
If you do have a vacuum leak stop running it until you fix it. What happens is the saw will start running lean - hot with reduced oil. It will end up seizing transferring aluminum from your piston to the cylinder. Then you will find out just how much fun it is to chase down vintage chainsaw parts.
Please post pictures - I'm curious to see what you have.
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