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Sometimes my 92 doesnt hold a steady idle and bounces between almost a stall and 1k rpm. It has never stalled from this. Engine doesnt show any code's. When i put on the A/C and the compresser is engaged it idle's beautifuly ( dont know why ) Someone suggested take off the IAC and clean it?

Also its not like this all the time, Will be good for a half hour than turns bad for a half hour

Whats the proper procedure to do that?

Check the intake tubing for leaks and cracks....

My 93 did the same thing. The problem with mine was the vaccum lines were all junked up. I gave it the seafoam treatment and it purred like a kitten. It runs smooth at first and with the A/c on because it makes the car idle fast when its cold or is carry more load.