Bad idle and stalls out - 2004 Ford F150

lots of causes even 100 possible (under bad engine list)
bad engine, bad spark or bad fueling << in that order.
or lack of air, idle ,IAC valve stuck closed or just dirty, clean it.
bad spark," 28 year old spark parts have no chance.
clogged injectors fully or in part, x cylinders.or leaking.
bad or old bad fuel, car parked for ages? unused, is bad fuel
not told what car does good?
full engine power up hill? besides stalls how does it drive???????
check engine lamp off? driving.?
can you prevent the stall easy with a fast right foot (gas/pedal)
if yes and engine seems smooth, can be IAC bad?
or EGR sticking open makes all cars stall. at idle.
at idle EGR is not enable but if stuck open all this fails

IAC = IDLE AIR CONTROL, (VALVE)

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Could be many things-- dirty IAC, bad MAF, bad tune up items, O2 sensor, clogged exhaust, bad TPS.

hot engine or cold or both, just a clue here.
wow gue$$sing is expen$ive.
is the CEL lamp glowing ever running,, YES?< then scan it.


ok so it stalls.
after the skipped 60k mile tuneup is done
if it still stalls.
so you use the right foot action fast acting at stall...?????
and you can prevent the stall easy.
1: very easy, iSC stuck closed or throttle idle detection is bad.
2: harder to stop stall but can , EGR leaks, main EGR valve.
3: impossible. this is gross spark failure ,or loss fuel or flooding

see how far you get on my list. and post back.

first ,now how the EFI works not guessing
it tries all the time to prevent stalls if it cant prevent it, it does stall.
rule2, the ECU controls idle speeds at all times the ISC is the slave to that..... so if the ECU open the valve and the stall gets worse.
its not the ISC/ECU fault. its fueling or spark.
a lean engine stalls. if lean enough ,no ISC can stop that.
a misfiring engine stalls, too.

a tech, dont attach the ISC< no he does not
he looks at spark an fuel rates. using , a scan tool.
The ISC can not cover the bad tracks of bad fueling and spark
nor a stuck open EGR.
THE ISC is dead if the TPS is set wrong, and the ECU thinks wrongly
that you are not at idle. so the ECU cuts idle controls

I use my scan tool to watch the, for error,s DTCS,. and pending errors
and watch for closed loop at idle. hot.
if it is in close loop at idle and it stalls then the ISC is failing
if rigth foot can save it easy.
id bet the fueling and spark are bad or TPS not closed, signalling close or the EGR is stuck wide open'

btw., if eCU drop s to limphome mod (scan it) it will infact drop all ISC
idle controls..

we look for the true cause, do tests, then replace parts
never the reverse or go broke fast.

check idle control valve if bad idle too low car will stall

Check oil level, but might be idle motor going bad. The idle motor kicks down the idle as needed as the rpm dictates. If sudden reduction in rpm occurs the idle motor normally keeps up and motor continues running at reduced idle. Unless its going out on you, then you may experience stalling when speed is suddenly reduced such as hard braking.

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

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Car stalls when MAF sensor is connected?

http://technoanswers.blogspot.in/2012/01/car-stalls-when-maf-sensor-is-connected.html

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Car Engine Stalls While Driving?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-stalls-while-driving.html

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Car stalls and throws white smoke from exhaust?

http://repairhelpcenter.blogspot.com/2012/01/car-stalls-and-throws-white-smoke-from.html

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Stalls And Dies At Stop Sign?

http://www.howtobyme.blogspot.com/2012/07/stalls-and-dies-at-stop-sign.html

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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1992 Chevrolet stalls and shutdown?

http://schematicsdiagram.blogspot.in/2012/04/1992-chevrolet-stalls-and-shutdown.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1990 mazda 323 stalls and quit running?

http://technoanswers.blogspot.in/2012/02/1990-mazda-323-stalls-and-quit-running.html

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2000 Toyota Camry: Idling and Stalling Problem?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-camry-idling-and-stalling.html

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1995 Toyota Corolla: Stalls, Sputters and Pops Through Intake Manifold?

http://whatisbyme.blogspot.in/2012/05/1995-toyota-corolla-stalls-sputters-and.html

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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?

http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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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

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1994 Toyota 4Runner: Stalls and Stops While Driving?

http://whatisbyme.blogspot.in/2012/05/1994-toyota-4runner-stalls-and-stops.html

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1997 Toyota Camry: Erratic Idle and Intermittent engine stalling?

http://technoanswers.blogspot.in/2012/04/1997-toyota-camry-erratic-idle-and.html

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Ford Maverick: No Idle and Stalling issues?

http://schematicsdiagram.blogspot.in/2012/04/ford-maverick-no-idle-and-stalling.html

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These details will help.
Thanks.

The first thing I would have checked is the TPS, ( throttle position sensor ), this is usually the cause of a high idle.

As far as running bad and fake stalling or stalling, there are 2 very common things that can cause that.

1. MAF, ( mass air flow ), sensor. If this is faulty you will have issues like, bad idle, loss of power when accelerating, poor gas mileage, fake stalling and stalling, eventually your engine will not start.

2. Oxygen sensors. Faulty oxygen sensors can cause very similar symptoms as the MAF.

I hope this helps you.

Possibly a transmission issue. The transmission has a "lockup" mode, where a clutch connects the engine directly to the transmission at cruising speeds. It is then supposed to unlock at lower speeds and for stopping. If it doesn't unlock, the car will stall at a stop. Try putting it into neutral (carefullly, so you don't go into reverse) as you slow down, if it doesn't stall out, it is most likely the transmission lockup mechanism.

If it stalls in neutral it is an engine issue. Bad idle control, bad ignition (it's easier to fire at high speed), bad fuel injector, bad air flow/pressure sensor... and more possibilities.

Sounds like a bad IAC (idle air control valve/sensor) that controls your idle when going from throttle to idle. If bad your idle will act crazy and can cause stalls easily. Pretty sure that's it.