[Veece]

In determining my problem. I proformed the Idle Speed Control Test, as printed in my Chilton, 1974-84 repair manuel.
1. Turn the ignition on and off.
2. The idle speed control valve should switch on and off audibly.
3. If it does not, turn the ignition on and disconnect the plug at the idle speed control valve and see if the voltage is present. If it is, replace the valve.
4. If no voltage is present, disconnect the plug on the control unit and check battery voltage between pins 2 (positive) and 4 (negative). If no voltage is present, check the power supply according to the wiring diagram.
5. If there is voltage at pins 2 and 4, bridge pins 1 and 2 and 4 and 5 simultaneously for a maximum of 5 seconds. The idle speed valve should switch audibly.
6. If the valve switches, replace the control unit.
7. If the valve does not switch, check the black and teh black/yellow wires to the idle speed valve for continuity and repair if necessary.

note that during my testin, the control valve worked, as indicated by #2, so then I went down to #5 as #'s 3 and 4 where not applicable. some of their wordings can be confusing, but always refer back to the original yes it does work or no it doesnt...Good Luck!