720 question
 

Just the other day I started my '85 720 and moved it to another parking spot.
It ran just fine as long as the automatic choke was on high idle but when I tapped the gas to knock the choke off it died and wouldn't start for a few minutes. The next time and every time since it'll start and run with the choke set and die as soon as the choke drops off.

What the heck is going on???