83 Urq hard starting when cold

["Joseph Rae" <quattro@ptinet.net>]

okay, my Urq is very hard to start when it has sat all day, it cranks over
fine, and starts, but will sit bouncing between 1000rpm and 2500rpm and
kinda caugh and sputter, pumping the throttle does nothing, sometimes it
will die and I will start it back up and it is fine, sometimes it will set
like that for about a minute then the throttle will work and it is fine???
Any Ideas on where to start??
Joe