Stumbles off of idle.

Hey Guys,
I recently dusted off my 81 1300 only to find that my 5/6 carb had
gummed up in the idle jet sump. The bike wouldn't idle at all. I took
off the float bowl and pretty soon discovered that the feed to the
idle jet was gummed up. A little carb cleaner solved the problem and
now the bike idles fine.

My problem is that there is a stumble just off of idle that has caused
me to stall it several times at stop lights. Once I get it to 2K it
runs fine all the way to redline.

PS I have DG six into one pipe fitted and the plugs read normal.

TIA KZCSI