lowering

is there a way to unplug my factory air suspension to drop my 91 P/A? or is there another slighly easy way to lower it?

These and aftermarket shocks require some pressure to keep the rubber bellows from abrading itself to failure, but only about 20PSI (for Monroe's), which doesn't lift the car much. Set the ride height controller properly and the compressor won't pump them up beyond the minimum required pressure. I put TRW variable rate springs in, and set up the controller as I stated, and the rear stays down, but will adjust for loads. In other words, if you want the occasional adjustment in load leveling, don't "unplug" the system.