Stovebolters -

Talked with the local shop that did the initial generator work. They recommended to first run a ground wire from the regulator to the firewall. The regulator I replaced did not have a ground wire.
Started truck with some throttle pulled. When I pulled battery cable, truck still ran, until I got to about 1/4 inch from pushing throttle cable all the way in, then truck stops.
A re-check of idle speed perhaps and trying to diagnose a power draw as Mike suggested will solve the issue.

Joe