There should be a light spring from the lever that has the throttle cable attached to the govenor air vane under the cowling.
There should also be a fairly stiff compression spring between the lever and the cable anchor - but this is only the cable return spring, and has no effect on the running.
Your cutting out problem is probably due to a perished diaphragm (under the cover on right hand side of inlet manifold).
phil_saunders(a)bigfoot.com
Phil Saunders, April 2009