Today while attempting to raise my idle, due to it stalling out when in drive with AC on, the assembly which the set screw and jam nut sit on broke off from the rear of the injection pump. It appears the rear portion that the throttle control is located bolts onto the rear of the injection pump itself. Has this ever happened to anyone? IT

appears to be cast, and it definitely had a crack before that I can see now where it broke, looking up from the pump it's a clean break. Thank you all.
This is the piece that broke off




Same piece




At the bottom right of this picture you can see the rod that sticks out right behind that.