trouble running

I have a 96 virago 750.  The bike wouldn't start after winter in the shed so I bought a new battery and I cleaned the carbs.  Now that the carbs are clean the bike starts but won't stay idling.  If I keep the bike on choke it will idle until riding then it stops.  I changed the spark plugs one was fouled with black stuff.  Now there are two new spark plugs, two clean carbs and a new battery.  What do I do next so then it could be riden so I could sell it??