Originally Posted by gfalcone
If you bought your car used...Like I did mine...here's a copy of a thread I found this morning...(when I was suppose to be working....shuuuush).....here's a trick you'll want to try !!! 
IT made one HUGE difference in mine..........
The Throttle is "Drive By Wire" and adapts to your particular driving
style. Do a TBA Throttle body adaptation.
1. Get in your car, it doesn't matter if you close the door or not.
2. Turn the key to the on (not start) position, the position just before the starter
turns over.
3. Press the gas pedal to the floor with the key in the "on" position.
4. Hold the pedal to the floor for five seconds, then turn the key back
to the "off" position (don't remove the key), then release the gas
pedal.
5. Wait 2 mins. for a full alignment ( 2 mins or longer)
6. Drive the car as you always do.
Depending on your driving style, this may or may not be a big factor. I do a lot of city driving so I noticed a big change after erasing my history. It is not hard to do this, just follow the instructions -
Key on, pedal down, 5 sec, key off pedal up, wait 2 minutes or more.
Keep the key in for the entire thing.
If this doesn't work, disconnect your neg. battery cable for 20 minutes. This will re-set the parameters in the drive-by-wire... Unfortunately it will delete your pre-set radio stations, clock etc. as well...
What differences did you see. My driving is almost never at highway speeds...