Extreme high idle have ck for vac leaks replaced throttle body and replaced egr componet lost what could it be

Dawn,
What is the mileage on this vehicle? The most common cause of high idle on cars with over 80,000 miles on them is a sludged IAC [idle air control] motor. This device is controlled by the engine's computer. It acts as a computer controlled vacuum leak to keep the idle speed up when you put the car in gear, turn on the A/C or put any load on the idling engine.
These items get sludged up [usually because you are not changing your motor oil often enough] and will stick open. This causes the fast idle. First step is to remove the IAC and clean it out with carburetor cleaner [aerosol type]. Reinstall the IAC [using a new gasket] and see if that helps. Sometimes, the IAC can not be cleaned, or the cleaning procedure works for a limited time [days or weeks] In these cases, a new IAC must be installed. I hope this helps.
Charlie