PLEASE W/E u do DONT TOUCH THE SCREW THROUGH THE MIDDLE OF CARB because it will need run proper ever again

If you have you have to take it to your local hobby shop for a carb service

Rigth lil screw with spring is the idle screw & the big one in a sleeve is the high speed fuel mix screw, the one go's through the carb is the low speed fuel mix "wich should be never touched"

What car is it?