Throttle body issue

Gotta 93 eg coupe with a jdm b16a in it, problem is.... Car is running thru gas like water & will not stay running in the cold I literally have to keep my foot on the gas pedal until it's completly warmed up. So I went ahead and got a stock throttle body for the car but where the idle screw goes the hole is completly drilled out.... Anyone know why that might be, or a suggestion for the depletion in gas. I seriously go thru a tank of gas in 2 days.. 
