Setting Idle speed / Stallingin gear

If the car is running rich,replace the power valve,and reset the mixture screws.Check the float levels and adjust them if needed.If its been sitting for a while,the gaskets can be dry and may need to be replaced.You could have a vacum leak,carb base or hose,and you may need a idle up soleniod to increase the idle when in drive,Mrmopartech