OK. I posted on this before and thought I may have solved it but its BACK!

D-Jetronic. There is a short period after the car has been run (gets fully warmed up) and is turned off, when it will cough and sputter if restarted. It's approximately 15 minutes to 30 minutes. Outside that time frame everything works fine. In other words if I shut her down, and run into a store for five minutes and come back out, no problem. But if I'm in there for twenty minutes, cough, sputter for a minute or so until she regains her footing. Over a half hour wait and there's no problem on restart. These seems to be fairly consistent.

I thin the last time somebody said injector seals. I pulled all the injectors off, and they're holders, and checked all of that...they're fine. My fuel pressure regulator is fairly new. Could it be fuel pump cavitation (whatever that is?). Should I insulate that center portion of the fuel rail that sits unshielded directly above the exhaust manifold? Could it be boiling the fuel in there an causing a vapor lock?