First let me say that the idle speed is not meant to be owner or shop adjusted.
But if it has been adjusted and runs ok warm, you might have a damper pin/screw thats in too far.Pin is gold colored in the late type,ealrier version is silver. The pin is the 12 mm hex at the rear of inj pump. 14 mm lock nut. loosen the lock nut and back out on the damper screw with warm engine at idle. at some point it will get very rough idling. at this point slowly turn the screw in just until it stops shaking. then lock it down.
Then recheck for cold stalls. The idle speed should be 750 RPM hot or cold, and is controlled by a centrifugal mechanism inside the injector pump.
Michael Haven CMAT,CMM,L1
MPH Automotive Services
16510 Park Row
Houston, Texas, 77084