Auto chokes have a vacuum port in them. If they are disabled/converted to manual, you will have a vacuum leak. It will not cause a dramatic affect like you are experiencing, but it doesn't help.
I am thinking that you have a fuel delivery issue. Partially clogged fuel lines, or a week fuel pump.
I recommend removing the fuel line between the fuel tank and the inlet side of the fuel pump and blow compressed air through it.
Then remove the fuel line between the outlet side of the fuel pump and the carburetor and blow compressed air through it.
Have an assistant which you are not very fond of watch the end of the fuel line while you blow air through it to see if it blows debris out similar to a spit ball through a straw. (It can get messy when the pressure builds up in the line before she blows.
After that, hook every thing back up except the line at the carburetor and turn the starter over to see if the fuel pump is moving fuel at a rate which is acceptable.
Carl
Last edited by 52Carl; 07/12/2018 12:25 AM.
