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Sounds like either a problem with dirty burners or possibly a failing gas valve. Is this a really old furnace?
I need some pictures of this unit. Baso valves were only in common usage decades ago and there's no way anybody has a manual for something that old. If you can give me an overall picture of the unit and pics of the controls (specifically the gas valve and Baso valve) we can take a crack at this. You can post pictures here by clicking on ADD FILES next to the SEND button