The idle air control valve

You read the codes so what were they exactly? That is only half of the issue. You can have codes that are showing up because something else failed. There is no code that says "replace injector"

Have you checked for a broken valve spring. Repaired a dodge engine with the same running issue as you have described and it was a broken intake valve spring.

First, have codes read to narrow possible causes. clean Idle air control valve or replace. TPS failure or "dead spots" send wrong signals to ECM. A blocked cat., low fuel or pressure, O2 sensor bad, sparkplug and wires faulty are some of many reasons.

For idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Replace Idle air control valve?

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Test Idle Air Control (IAC) Valve?

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Idle Air Control (IAC) Valve operation?

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

I would take a look at the plugs and see if they are fouled. You might have a bad fuel pressure regulator. Also, the control module or pick up coil could be bad.

check the actual fuel line. Also is it fuel injection or carberator

idle air control motor might be bad
controls idle of hte engine

if it dies when it comes back to a idle check the idle air control motor and passages in the throttle body

Check and clean idle air control valve
check for vacuum leaks
suspect idle air control valve