Sounds like a vacuum leak so look for that before you tune the carb.

If there isn't a vacuum leak then you'll need to sort out the idle circuit since it is way off. If you don't have a wide band then you'll have to do it the old way. Get it running at a fast idle and then start to turn the idle mixture screws. If it dies when you screw them out then you are too rich. If you are too rich at 1/2 turn out then the IFR in the metering blocks are too big. Reduce the size by a couple of numbers and try again.

A 1050AN is a very tunable carb. Do you have the right jets for that carb. The idle jets are a small size. Getting the idle circuit correct is the key to having the carb run right.