i have a 99 saturn sl, and after the engine warms up and you stop at a stop sign the engine revs up to about 3000 rpm's. don't know if anyone has any advice, please help.......

That soulds like a sticking idle air control valve,...try some carb cleaner and spraying into the trottle body and try some fuel injector cleaner in the gas. Does or have the check engine light came on at any point of time this happen? The engine temperature sensor could be at fault too.