Hello everyone,
  I have a 1946 Oliver RC/gas/6-speed trans.
  When I have it in 5th gear and increase the throttle, the tractor seems to intermittently 'lunge'-I don't know how to explain it. 
   Seems like its not getting gas at regular, very short, intervals. 
   Is this a carb adjustment I need to make?

Any guesses would be very much appreciated!