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My best guess is gonna be a vaccum leak... pick up a cheap can of carb cleaner. Start your car and listen for a whistle or something close. it will probly be near or behind the throttle body. take your carb cleaner and spray it with out the little red hose around the back coner on the driver side of the motor. you can visually inspect the area after you hear an increase the idle. if you dont find it there spray all around any where you see a hose. Hope it helps. a vaccum leak usually wont set a check engine light on OBD 1 cars. Good luck.
What was it doing before? was the idle fluctuating before you cleaned the iac. If so then you probably need to replace the sensor. what did you use to clean the sensor? Some IAC's are sensitive and cannot be cleaned without damaging them.
Fluctuating an high RPMs sounds like a leaking or missing vaccume hose to me, I had simmilar problem found open hole with hose off, replaced it now the RPMs are under 1000 again.
As for the stalling I also am having a simmilar problem, and am finding air in the fuel rail, I suspect the fuel pump is going.
I cant go more than a mile without problems.
could be a number of things. timing may be off. timing chain could have jumped but then you would have lack of power and backfire. could have a vacuum leak. throttle body have carbon buildup around the butterfly valves? Valve problems. compression problems. many things. Hope its nothing major I know I am not being much help but those are some things to look at.
If the check engine light is on, take the car to an autoparts store and have them use a scan tool to retrieve any fault codes stored in the car's computer. Most parts stores will perform the scan for free. This will show what faults the computer has identified and what systems are being affected. That will eliminate speculation. Hope this helped and best wishes.