“My Chimney Sweep told me it was the Boiler starving for air in the basement. My Heating Guys tell me its a chimney drafting issue.”

Both are two sides of the same coin. If you want help, listen to them, they might be able to solve it, if they know enough about draft.

http://www.HeatProUS.com energy businessmen’s knowledge

Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.