Possible vacuum leak, Throttle positioning sensor, idle speed solenoid, Other possibilities too. Don't let it do that for too long, severe engine damage can occur.
SOURCE: reving up to 3000 rpms from idle
Check all your vacuum hoses especially the larger ones like the one from the brake booster to the intake. Check them for cracks of see if they're broken. Also spray WD-40 or carb. cleaner on the intake manifold where it meets the cylinder head. If the idle changes, you have a vacuum leak there.
SOURCE: 94 eagle talon constant idle problem 1500-3000
The idle speed motor is bad had this problem went to junk yark and got a different idle speed motor took it apart and used the parts in mine worked good.
SOURCE: 1996 Eagle Vision 3.5 idles too fast. How to fix
yes propane or carb spray will work, just spray around the entire intake area and all vacuum hoses, if u hit a vacuum leak the engine idle will change.
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