I first wanted to apologize to everyone that wanted pictures of my
conversion, but I still haven't been able to abscond with my friends
digital camera yet.

Now for the problem.  As you may remember the last time I wrote I had only
let the van run for a few seconds because I didn't have an exhaust on yet.
Well I got an exhaust system built (I think it is a neat system, more on
that latter)and got the thing running for real.  The problem is it starts
up fine, runs for 15 seconds or so and then starts stumbling and will stall
if you don't keep the throttle in a little bit.  After it warms up for a
while it will continue to run fine without need to blip the throttle at
all.  But, heres the real problem.  If the van is allowed to stall it
becomes harder to start each time you try to start it.  If the engine is
allowed to warm up for say a minute and you shut it down and then try to
start it again it just cranks and cranks and never catches.  But if you let
it cool down for 30-40 minutes it seems to fire right back-up.

So far I have tested the O2 sensor (bad so I got a new one), all the
grounds, vacuum lines, any connections to the intake manifold and airflow
sensor, cold start system, coil, rotor, cap, various electrical connections.

Does anybody have any idea what maybe causing this?

Dave K.