Pretty obvious hissing sound, coming from back of engine. After brief start and a high idle, it drops out and dies. Im not sure which line it is, but im sure they are all old and could use replacing. Could I go to parts store and just tell them I need vacuum lines, or 3/8 line or what do I ask for, Im not sure if there is a specific parts number on it. Also, will i need to replace the plastic t fittings? Maybe someone could just give me a basic run down. The haynes manual doesnt say too much about it.