I have just replace my old and tired 2.1 in my 86 vanagon with a new
rebuild from Boston Engine.  Today, after double and triple checking all
of the connections, water lines, etc. I tried to "fire" it up.  Got good
spark, and as long as I kept the ignition switch on, it acted like it
would take off.  However, whenever I released the ignition switch the
engine would "lope" for a few turns, backfire, and stop running.  Thought
I would turn to the vast knowledge of the list and solicit your
suggestions as to what I might be overlooking.  Thanks in advance!

Larry in Lincoln