When you pull the choke all the way out, you are blocking off the air flow to the carb.
Chances are you have a good sized vacuum leak somewhere.
Start checking around the base of the carb and trace all your vacuum lines and see what's leaking.
This is one of the main reasons I went to FI.
Seems like there are about five miles of vacuum lines in the loop and if one of them are leaking you can have all kinds of problems = ))
Once your engine is warmed up, the choke should be pushed all the way in.
85 CJ-7, 258 I6, 35's, 4" BDS suspension lift, 1" body lift to clear tires, swaybar disconnects, Currie tie rod and steering rod, Rusty's BEEFY steering gear mount, Steering brace, Superior one piece axles, Detroit locker rear and Detroit TT up front, T5 Tranny, Dana 30, AMC 20, Dana 300 TC,TR upgrade, TJ flares, and Howell TBI.