[Farmall] Super A Idle Puzzle

[Ben Wagner]

Hello,

I am fifteen years old and I am restoring my 1948 Farmall Super A. 

I ran the tractor before I really tore her apart.  The engine works 
fine, but it won't idle.  I pull the throttle lever back, but the 
throttle stays full open.  However, if I pull on the shaft going to the 
carburetor from the governor, the engine will finally idle.  As soon as 
I let go of the shaft, it throttles back up, almost like it can't hold 
the throttle in idle.  

A friend said that he thought it was in the "automatic idler," but I 
have never heard of a part called this. 

My guess is that either I am missing a spring that holds the throttle 
shut, or there is something amiss with the governor.  I have the parts 
book, but I can't see a missing part.  I appreciate any help any of you 
can give!

Thanks, and Merry Christmas!

Ben Wagner