Still working on high idle speed. voltage to the idle control starts out cold near zero and builds up as the engine warms up. however there is no current flow! the device works when i put voltage directly to it. what am i missing? also there is what appears to be a vacuum switch behind the battery with 3 wires going to it but no vacuum line. part no. 006 542 50 10. anyone know what it is used for. i'm grasping at straws now!