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i have a 1977 280z coupe 4speed. i tried the oil cap trick and it made no change in the idle. so i said, "screw it" i'm just gonna replace ALL of the vacuum lines. the thing is, i don't think they are all in the correct placement to begin with, and some make no sense. so i need someone to email me a complete vacuum diagram, if possible. also, on the right side of the engine compartment, there are 2 of what looks like vacuum switches, round with a vacuum line attachment. the rear one is hooked up, but the front one is'nt. what do these control? help would be appreciated.