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You have a hydarulic clutch, if this condition came on slowly you may just need an adjustment, some models have adjustments available down by the clutch pedal area. otherwise you could have a fluid leak or component failure. check to see if the clutch fluid resevoir is full, if not, fill it with the proper fluid and see if you can bleed the air out of the system. if it is full then you probably will need to replace the clutch master cylinder or slave cylinder.
Check both sides of the gearbox for a plug (screw) simular to the drain plug on the bottom. This is a level screw remove it then on the bottle of trans. oil their should be a lid with a pipe on it put the pipe in the hole and squeze the bottle until the oil comes out of the hole in the gearbox.
Although this isn"t a proper fix, and may affect emissions, I ran accross this problem on a friend's 87 2wd wagon.
There is a dashpot that controls a lever the Idle set screw is on, I am guessing it is a decel valve that closes butterfly when coasting in gear. I never looked at a manual to figure out what controls the vacuum valve that is on the passenger side of the engine compartment, but if you disconect the vacuum line and plug it that lever will not back off and idle will remain where you set it with the adjustment screw.
Make sure the engine is warmed up and not on a fast idle cam before adjusting idle.
The car is a 5 speed, I not sure if automatic cars are the same.
The car idles fine now and still run's great and gets 37+ MPG with 240000 miles!
If you want to fix it properly you would have to diagnose why that dashpot is being actuated at idle