I have a 00 4.0 4x4. I have 162 on it. I have a problem when i start the engine and the idle does not idle right. It is at 600 yea 600 rpms. I can rev it sometimes and it will reset itself and idle fine. I have a couple ideas but not sure if they are right. I was thinking it was the TPS (Throttle Position Sensor) or the EGR which im guessing stands for (Electronic Gas Regulator) but not postive. Does anyone have any ideas if these assumsions are correct? Please help so i can fix it this W/e. Thanks Steve Martin.

 

its kinda hard to geuss. is the check engine light on? BTW, EGR stands for "exhaust gas recirculation"

 

It could be the IAC valve. BTW what is wrong with 600 rpm? I set mine to idle at 550 rpm.

 

Sounds like you have a sticking IAC or vaccum leak.

 

No check engine light. thanks for the egr info and where is the IAC located? I think in drive it idles at 8 with the brakes on in park it idles about 11 or 12. I take the 600 back. i checked and its actually 400. Thanks guys.

 

The IAC valve is located on the side of the throttle body.

 

ok thanks ill check in tomorrow morning.