1999 Saturn SL1 high idle speed

I would start looking for a vaccuum leak especially with that code. Start looking at the pcv hose that runs from the valve cover to the intake manifold its short and s shaped they get holes them and leak vaccuum very common. If thats not leaking then spray some carb spray around intake manifold gasket between the head and manifold and any vaccuum hoses while the engine is idling if there is a leak u will loose engine rpms might even die out. Start there then we will explore ur sensors. Let me know what u find.
Louie

Clean the Idle Air Control Valve. It's on the throttle body below the throttle position sensor. The IAC is like a giant needle valve that has a 4-pin connector on the back side of the throttle body, nearer to the firewall. It's hard to see, often overlooked, but easy to remove, clean with a toothbrush and any spray type choke cleaner. It's held on by two torx-type screws. I can't remember what size--dropped and lost the bit.
I fought this problem for two months and spent over $300 on tools and parts only to fix the problem with $.25 worth of spray.