If it has efi the iac is the problem and if it is carburetted it will be the idle air control OR you could have an intake leak BUT check for DTCs and the IAC will be setting p0505 and also:
Engine idle speed can be adversely affected by the following:
1.an intake air leak;
2. improperly adjusted throttle stop or a misfiring cylinder;
3. leaking injectors will cause fuel imbalance and poor idle due to different air/fuel ratios in each cylinder.
(To check for leaky injectors, first remove the air cleaner and then with the throttle wide open, turn the key ON for 2 seconds and then OFF for 2 seconds five consecutive times and look fro any sign of fuel in the induction system. If there is any you will need to replace the fuel injector(s).;
4. vacuum leaks
5. contaminated fuel;
6. excessive oil in the crankcase (oil sumping);
7. TPS reading greater than 1% (possibly caused by a throttle cable misadjustment);
8. battery voltage reading of less than 9 volts;
9. a VSS greater than 0 will disable idle speed control; and
10 loss of battery power to ECM pin 31.
It
can be low fuel pressure issue or clogged fuel pump. Or its engine related
issues,---------------
Check
the help link mentioned below to troubleshoot the problem: ------
Engine stalls when gas is given?
http://technoanswers.blogspot.in/2012/01/engine-stalls-when-gas-is-given.html
-------------
Car stalls when MAF sensor is connected?
http://technoanswers.blogspot.in/2012/01/car-stalls-when-maf-sensor-is-connected.html
------------
Car Engine Stalls While Driving?
http://schematicsdiagram.blogspot.com/2011/12/car-engine-stalls-while-driving.html
--------------
Car stalls and throws white smoke from exhaust?
http://repairhelpcenter.blogspot.com/2012/01/car-stalls-and-throws-white-smoke-from.html
-------------
Stalls And Dies At Stop Sign?
http://www.howtobyme.blogspot.com/2012/07/stalls-and-dies-at-stop-sign.html
------------
GMC Sonoma Stalls and idles low
http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
------------
Nissan Pathfinder stalls and bucks on Acceleration?
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
-----------------
1992 Chevrolet stalls and shutdown?
http://schematicsdiagram.blogspot.in/2012/04/1992-chevrolet-stalls-and-shutdown.html
------------
Stumbling and stalling at idle after engine rebuild?
http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
--------------
1990 mazda 323 stalls and quit running?
http://technoanswers.blogspot.in/2012/02/1990-mazda-323-stalls-and-quit-running.html
-------------
2000 Toyota
Camry: Idling and Stalling Problem?
http://whatisbyme.blogspot.in/2012/05/2000-toyota-camry-idling-and-stalling.html
---------
1995 Toyota
Corolla: Stalls, Sputters and Pops Through Intake Manifold?
http://whatisbyme.blogspot.in/2012/05/1995-toyota-corolla-stalls-sputters-and.html
----------------
1999 Toyota Camry: Erratic stalling and high engine RPM at
idle?
http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
--------------
Dodge Dakota stalls, stumbles at idle. Has low fuel flow and
runs hot?
http://schematicsdiagram.blogspot.in/2012/03/dodge-dakota-stallsstumbles-at-idlehas.html
--------------
1994 Toyota
4Runner: Stalls and Stops While Driving?
http://whatisbyme.blogspot.in/2012/05/1994-toyota-4runner-stalls-and-stops.html
---------------
1997 Toyota Camry: Erratic Idle and Intermittent engine
stalling?
http://technoanswers.blogspot.in/2012/04/1997-toyota-camry-erratic-idle-and.html
-------------
Ford Maverick: No Idle and Stalling issues?
http://schematicsdiagram.blogspot.in/2012/04/ford-maverick-no-idle-and-stalling.html
-------------
These
details will help.
Thanks.
http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
--------------
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