Sucking noise through throttle body when first started

Hello, so I have a 1974 Dodge D100 custom street truck with a 360 Magnum from a 1995 Dodge Ram 1500, it has headers and a cold air ram intake. After it has been sitting all night and when you first start it there's a loud sucking noise through the throttle body and it will stall the engine a few times, after it warms up the engine runs fine. The throttle body has all new sensors.