Shuts off when the engine is warm

I backed off a curb and the front undercarriage (frame) came down hard on the curb.
The car stalled, but easily started up again. Since then it repeatedly shuts off anytime the engine is warmed up to normal and is allowed to slow to idle rpm. When started from cold the fast idle operating keeps the engine running until the fast idle kicks off, then it will die at shut off. The car runs great as long as the speed is above idle. Always starts easily after it shuts off. All vacuum lines are connected. I think it has something to do with the hard landing on the curb. Could the idle jet somehow have gotten plugged? Could the hard landing have somehow retarded the timing? Seems like it would not run well if this were the case. On the vacuum system schematic under the hood it shows an "idle controller" on the carburetor. Could this be the problem? Any other ideas or suggestions?
Assuming I can figure out the problem, getting parts for this old Honda is getting tough. NAPA does not carry a carburetor for it. Only a kit to rebuild the carburetor. Can you suggest a good Honda parts source for older models? Maybe a quality salvage yard that specializes in Honda parts.
Thanks so much for your help. This is much too good a car to junk. It is our main "farm truck".
With appreciation,
Tom H.