2001 ford taurus, idles ok but when you hit the gas it stays high for about 15 to20 seconds. even when driving, hard to stop with rpms at 2500/ 3000 rpm

SOURCE: 2007 crown vic 4.6 l idles high on startup

This sounds like a normal condition.What happens is the cold start emission reduction component monitor(software program in the computer) is running.
Cold Start Emission Reduction Component Monitor
The Cold Start Emission Reduction Component Monitor was introduced for the 2006 MY on vehicles that meet the
LEV-II emission standards. The monitor works by validating the operation of the components of the system
required to achieve the cold start emission reduction strategy, namely retarded spark timing and elevated idle
airflow.
When the CSER strategy is enabled, the idle air control system will request a higher idle rpm, elevating engine
airflow. While this CSER elevated airflow is requested, the low airflow test compares the measured idle airflow from
the MAF sensor to the commanded idle airflow from the idle air control strategy.

SOURCE: 2001 FORD F150 ENGINE SURGES AND DIES AT IDLE

Check all of your vacume lines. If it isn't a vacume line it is most likely the O2 sensor.

SOURCE: my 2002 ford taurus's gas pedal it get's stuck

It is very rear for the pedal to get stuck it is most likely the acselaretor cable is geting stuck du to:
1 Gunk at the trotle body , clean with carburator cliner.
2 Acselaretor cable path has changed by some one and it is getimg stuck . coreckt the path

SOURCE: Ford Taurus 2005 model. Too high rpms in idle.

check tps senser

SOURCE: My 1986 Ford F-150 5.0 EFI runs good, but when I

Does it rev high when started cold or hot? If it does it either hot or cold, check the throttle position sensor on throttle body. If that is not bad, then check the automatic choke sensor.