Idle Problem?
 

OK check this I was wondering what most of you guy's Mustang GTs idle at? Mine is idling at about 500-600 and have occasional ups and downs. Need feedback please!

That is about right, though a bit on the low side. The idle is gonna change a bit as the car adjuts to conditions and the IAC opens and closes. It should not be jumping all over the place, but it does not hold completely steady either. Keep in mind, that your TAC is an analog readout, so the actual reading may differ a bit.

I usually idle anywhere between 600-1100. My idle jumps probably 200-300 everytime I stop though, ever since the exhaust install. Think it could be the front o2 sensor reading causing it? I haven't got a tune yet.

i had the same problem and all i did to fix it was adjust the bolt on my throttle body so that the trottle was held the tb a little more open thusmaking the idle higher....it seemed to me that around 850-900 rpms the needle sat still.i thought it was a big problem but it was real easy to fix...did you install a new tb...or is it stock????

waoo...thanks for sharing here...hey gyz...i m new here..can i give my views here??