Where do I find the diagnostic tests for this? I don't know where to turn to diagnose this as Haynes manual has nothing about it in there..... I have no way of knowing where it all runs to or how it routes and fits together.... all of the actuators/diaphrams seem to hold vacuum pretty well..... but they don't each open the way they should to get the airflow to where logic would tell me they should... any help would be greatly appreciated.