I have a 20hp briggs and stratton ohv v twin motor that will not run right. Unless choke is pulled out it will not idle.

Hi,
Sounds like a dirty fuel system to me. Also, suggest that you view the YouTube video on the adjustment of the valves on the model engine at:
Lawn Mower Repair Valve Adjustment V-Twin - YouTube
And as the Internet is known to have, there is another site with a pictoral tutorial of the cleaning of your carb in two parts at:
Disassembly, Cleaning and Repair of Briggs Intek V-twin Two-Barrel Nikki Carburetor - Part 1
And:
Disassembly, Cleaning and Repair of Briggs Intek V-twin Two-Barrel Nikki Carburetor - Part 2
Peace,
Clarke