When my 1949 8N idles the engine sounds pretty good and idles fairly normal.
As soon as I run the PTO with my 5' shredder it bogs the engine down and it goes from a normal idle to an uneven idle, revs up and down.
I replaced the carburetor, and replaced the points and the cover but it did not seem to help much.
The fuel is new, but not ethanol free. Could the ethanol be playing a part in this?
Any other suggestions?