The problem you describe could be result of a few different things; however, I would first check your vehicle's Idle Air Control (IAC) sensor/motor. This sensor/motor is located on your vehicles, throttle body and is easy to access. The purpose of this sensor is to control the car's idle under various operating conditions including ambient temperature. In order for it to function correctly, the internal components must be clean (meaning, little or no carbon build up) and it must be undamaged. Sometimes the IAC can be cleaned; however, if this cleaning procedure is not properly done, the IAC can become damaged. This sensor is also sometimes called the "Cold Start" sensor. A new IAC will cost $50-$100. My guess is your IAC needs to be cleaned or replaced. Good Luck!
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It can be issue
with IAC( idle air control valve) causing the problem.
There
are many other possibilities causing these idle issues. Engine idles rough.
There
are few help links with solutions to troubleshoot such idle issues.
I
suggest you refer the link below and follow
its troubleshooting details:------
Click
the link below:-----
-----------
http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
------------
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
---------
http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
------------------
http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
-----------
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
-----------
http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
--------
http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
-------------
http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
------------
http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
-----------
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
---------
High
Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
--------
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-------
http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html
----------
http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
-----------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
These
details will help.
Thanks.
Its
cold start issues:----
Go
through the list of help links mentioned below:----
Click
the link :----
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------
These
will help.
Thanks.
Its
cold start issues:----
Go
through the list of help links mentioned below:----
Click
the link :----
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------
These
will help.
Thanks.
Its
cold start issues:----
Go
through the list of help links mentioned below:----
Click
the link :----
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------
These
will help.
Thanks.
Its
cold start issues:----
Go
through the list of help links mentioned below:----
Click
the link :----
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
--------------
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
--------
http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html
----------
http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html
-----------
These
will help.
Thanks.
Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
---------
will not idle when cold?
http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html
----------
runs lean and idles rough?
http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------
Engine stumbles coming off idle when warm?
http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
------------
Erratic idle on car?
http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
----------
Low idle when cold out side?
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
---------
Idle Air Control (IAC) Valve Replacing?
http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
-----------
Replace Idle air control valve?
---------
Test Idle Air Control (IAC) Valve?
-------
Idle Air Control (IAC) Valve operation?
----------
Engine quits at idle?
http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
------
While stop engine idles like cylinder missing?
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
This will help.
Thanks.
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