Air is just the AIR pump system. Only works when first started
[ cold emission related ]
The cam solinoid is where to check as that is what moves the valve timing. Definately start looking around there....
As you have the PM CD with all the OBD-1 codes, be aware that you can get to them through the other pins on your diagnostic socket. As you can now see from the CD , this system is quite sophisticated for pre OBD=2.
Make a led/sw for $5 and go code hunting......