while driving around town today i had not gotten on it hard yet....but i come to a complete stop at a redlight and i ideled regularly then after about 15 seconds i went down to like 500 rpms then it bounced back to like 1500 rpms and did that for like another mintue and i ahve no clue what it could be....i have a 00 gt.....if you have any ideas on what it could be please let me know

 

Clean your Throttle body, MAF sensor and IAC. Should clear it right up.

 

^^^^^^exactly

 

that still happens to me sometimes even if i clean everything....

 

put a bottle of fuel injector cleaner and see if it helps

 

ive done that too everytime i change my oil. I wanna get a new fuel filter. I have over 110k on the clock so i think its about time for a new one...

 

well thats a big probability right there....that should be your problem

 

If fuel filter isn't the problem, which it probably is...check your TPS (Throttle Position Sensor) located on your throttle body. Mine went bad around then, replaced and problem solved. Good luck!

 

okay thanks sorry to jack the thread op...

 

Just from personal experience I'm going to say that Ford's Idle Air Control Valves suck. I've had one go out in both Mustangs I've owned.

Does the problem happen when the car is cold?
Once the car is warmed up does the problem go away?
When you shift, do you rpm's fall really quick?

If you answered NO, NO, and NO, then the IAC is probably good. Couldn't hurt to clean it though. I mean if you're pulling things apart, you might as well lol!