Wont idle it will start but wont stay on wont idle

Not knowing if you know anything about idle speed settings, idle mixture, etc., first check to see if all carburetor components are fully in place and are in good shape. A vacuum leak will cause the symptom you are describing. After doing that, adjust the idle stop screw. If it just won't idle even after doing that, take out the idle mixture screw, blow out the screw hole with compressed air, and gently screw in this screw all the way in. (DO NOT FORCE it.) Then open it 2.5 turns. Adjust this screw for a good strong idle while adjusting the idle SPEED with the idle stop screw. Get assistance if you don't know how to do this stuff. Good luck.