[84LX89GT]

You could try cleaning out your Idle air Control valve (Inlet air control valve...same thing). Alot of times carbon will build up inside them and they will stick causing either too much air to be let into the engine or too little. One will cause a low idle, and stalling, the other will cause a high idle. A IAC valve gasket and o-ring will cost less than $5 so it's worth a try. Another trick you could do is try tapping lightly on it with a hammer, you'd be amazed and what a little smack with a blunt instrument can do sometimes . Unfortunately because of the design the IAC valve sucks in alot of PCV gasses that stick to the valve and then harden on the shaft causing it to stick. Carb cleaner works great to clean them out.
Good luck,