1995 Other Saturn Models constant reving high idle

Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed.

i don't know if you've found your problem but if you haven't, you may never know what is wrong. i have a 2001 and it's been doing it since 30,000 KM's. I now have 160,000. I have my own file at GM head office for how many times they have pulled my poor car apart. My father-in-laws car does it too. GM knows what the problem is but they will not admit to it. They are refusing to continue looking at my car, so we may never know where saturn went so wrong! My entire car has been re-built by them. would have been cheaper for them to give me a new one!