tracker idle problems

I have a "92 geo tracker 1.6l engine . my problem is when iin idle mode after warm up my idle goes up and down. I done a complete tune up. i put a new O2 sensor, egr valve, coolant control sensor, distributor cap and rotor, and injecter. The idle still goes up and down. I'm lost.
any help/suggestions would be greatly welcome. Thanks in advance.

i would check out your IAC valve.. could be just carbon buildup or could be on its way out...

i would check out your IAC valve.. could be just carbon buildup or could be on its way out...

Hate to sound stupid--but what does IAC stand for and where is it located? Is it difficult to remove to check out? Thanks in advance, Dave

PS.. I only asked what it stands for as I did an autozone.com search to see how much a new one would cost and I cant seem to find it listed.

Thanks, DG

Hate to sound stupid--but what does IAC stand for and where is it located? Is it difficult to remove to check out? Thanks in advance, Dave

PS.. I only asked what it stands for as I did an autozone.com search to see how much a new one would cost and I cant seem to find it listed.

Thanks, DG

I did a google search and looks like it stands for Idle Air Control...

i have a 95 Geo Tracker and the soft top on it is done for and i was wondering if anyone knew where i could get a used soft top for pretty cheap price aint got alot of money need a top to get me through the winter please e-mail me at silent463@hotmail.com Names Justin if u do e-mail me please say who u are and what site your from thanks PLEASE HELP

I have a 91 Tracker with the same problem as the original poster.
Can anyone help me out?
Where is the Idle Air Control located?
Thanks !

the IAC valve is located in the throttle body

Take a look right here: Ed

http://www.autozone.com/az/cds/en_us/0900823d/80/1d/ff/d2/0900823d801dffd2/repairInfoPages.htm

for the 91, look here, Ed
http://www.autozone.com/az/cds/en_us/0900823d/80/1d/ff/e1/0900823d801dffe1/repairInfoPages.htm