my worked 5.0 wont idle right.

i have a 88 mustang gt hatch back 5.0 i just bought it. it has the trickflow twisted wedge heads there full intake and stage 2 cam bbk intake and 3 inch exaust and i cant seem to keep it running without my foot on the gas it will shut off. also it has the egr valve disconected should i reconnect this? and there is a little place for a hose on the lower intake that has nothing on it should i connect this to vaccum my car also has a regulator for fuel pressure with a hose port on it should i run that to something? i really know nothing about cars except what my friends have told me so any help would be greatly appreciated thank you

i have pluged and unpluged vaccum lines everywere on the car no luck still and when i say foot on the gas i mean feathering the gas to keep the rpms up so it dosent shut off i really dont understand all the car lingo im new to the motor world before 2 weeks ago all i knew how to do was check my fluids and fill them up(in my truck) and drive and i dont do that to well either being the fact that i wrecked my truck i have a vacum line running from the tree to the intake its pretty decent sized i also have a bbk fuel regulator is there suposed to be a vacum running to that or not? and i have 30 pound injectors and my friend told me the car was mass air converted i have no idea what that means i have no smog pump and also no air conditon or heat that could cause all the vaccum lines not connected