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bad compressor? (seizing) or
or engine is so weak, at idle (lean), that it cant run your compressor.
the reason for the lope is the ECU idle speed controls going crazy.
id say, the ISC is a victim here.
You need to start using high octane gasoline. Yes the 96 or the 93 not the 89. It costs a little more but it is worth it as it is better for your car and it runs better idling. The brake pads sound "rough" they probably need to be replaced or switched/flipped. This is a cheap and easy task. It may shudder from the fact that it is getting force feedback from the brakes.
Clean your fast idle thermo valve (fitv) if that dont Work try cleaning idle Air control valve (iacv) you can go to google images to see where they are located on the intake manifold if you dont know And also if you dont know you can search google on how to clean these parts. Slightly dirty fitv was my problem cleaned it no prob. Since.
There is a coolant passage that goes to the idle control system. The idle control itself is not bad. Cleaning this passage will make it normal again. I have fixed a 95 honda accord this way, and a 97 honda accord. You will need to remover the whole assembly. Actually the whole rapair doesn;t need parts so thats good news for you. Be carefull since the idle control is made of aluminum, and can be damaged easily. I damaged the one I was working on, thankfully I also have an aluminum mig welder so I was able to repair it like new.
try checkin your idle air control. most of the time it is a vacuumn line going into intake.pull it off and if the car revs up dont worry, it wont hurt it. if it does simply put it back on, if it dies you have a bad vacumn.
it is normal for your car to idle down when the ac pump cuts in just have your timing checked and adjust your idle as necessary at about 750 rps at normal idle with ac off also just make sure they havent overtightened the ac belt and pulley.