How high should the idle be on an '86 with rear cabinet installed A/C idle when the A/C is on?  Mine has always idled very high.  I don't have a tach, but it is probably over 2000.  I have recenlty repaired or replaced the TB switch, temp sensor 2, injectors, vacuum lines, and cleaned grounds.

  It seems to run beautifully most all of the time.  I used to have an intermittent situation where the idle would surge when the engine and ambient temp were hot.  I have not experienced this since fixing some vacuum lines.  It was intermitent, so it could come back, but it has been gone for quite a while.

  I assume that the high idle with the A/C is controlled by the Idle bypass valve on top the motor.  It hums when the key is on.  Is there a voltage that is sent to it that I can check when the A/C is engaged?  Is there by chance a vacuum advance on the distributor?  I did not notice any lines going to it.

  Maybe it's nothing to worry about since the van is running so nice in general.