Engine doesn't idle fast enough to keep car from rolling back on hill does not stall runs good

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)

What causes an engine to stall at idle?
If the engine stalls while idling or driving, the engine may be running out of fuel or not receiving enough fuel pressure to keep it running. The most likely cause of this kind of stalling would be a fuel pump that is not spinning fast enough or is intermittently cutting out.

f you are on a steep enough hill your car will roll backwards auto or not. if you are not on the gas the engine is simply not making enough torque for the transmission to keep you from rolling.

it stalls with foot in the throttle...... really.? try to say what you and car are doing at the od switch flips.. sure moving fast.
but doing what, up hill down, flat, acceleration, decel, or coasting?

ok, this can be real easy.
engine tuned up is 99%
ever heard of scan tool.
connect it, and log data (or person 2 watches) and log DTC and streaming data?
if the Magic relay called ASD drops the the engine stalls (this is its purpose) and if it did the SCAN TOOL tells you why it did.
every time...
asd class 101.:
http://www.fixkick.com/Jeeps/ASD.html

is transmission stuck in 3rd gear, limphome.??
the trans mission will not stall a car. 99%
that is because the clutch has a stall speed.
and slips greatly at idle, say 800rpm is hot idle , so if say the trans solid locked into top gear. and you came NEAR a stop sign, coasting... and braking.. say.....
and as rpm dropped, the clutch will slip and no trans ever stalls the engine.99% unless the engine is super weak and misfiring hard.
or ASD DROPs !
that is why we scan to see ALL ERRORS> engine and trans.
see?

2000 WJ jeep , USA
when STALLS only driving , any time , or just as I come to stop it stalls. or stalls parked only. my guess parked only.
which engine is there?
3.1L
4.0L
4.7L ?
what transmission, what A/T trans, 42rle or ?
mileage comp. like mine, it's useless. forget that. but dead battery reset that, and is of no matter.
questions are plenty on all cases: (cars are complex!)
the engine stalls.? sure.
in to gear means , Drive and Reverse right?
when you do that the PCM adds more air via the ISC idle speed control valve. and just my do that. and is good sign.

1. besides stalling, does engine and trans work great , driving, like fast /slow, , hot/cold engine, , up hills too, fast?
2. is the CEL lamp in dash on key on and off running.?
3. did you check all fuses.
4. what is miles on engine.
5. when did it run perfect last, 1 week ago, 1year, 10 years?
6. ever get and engine tune up this decade? spark parts and filters?
7. is the ASD relay dropping out just before the stall>?
8. is engine rpm below 800 RPM before the stall? hot engine.
9. does engine reach and old full engine temp, 180F or more?
10. use a scan tool and see all DTC errors yet, dont skip this.

hot or cold engine,or both????????????????????
sure...
the ECU works OVERTIME; hard, to keep the engine running.
this is done by the action of the ISC valve.
so can you keep it running with a fast right foot??????????
a real mech needs to drive car.
does it have full power on hills?
is the tune up service done, the 60kmile repeats and needs to be done.
the ECU can not keep idle right on any engine that runs like crappppppp.

1: all fuses good.
2: engine never warms to normal 180F+ temp and hold???
3: not tuned up.
4: engine misfiring.
5: engine flooding.
6: engine starving for fuel.
7: OMG, the ISC wires fell off, (inspections do work on old cars)

there are simple tests. for each case.
one more #8. EFI system lost 12vdc power. stalls.
12.6vdc not running, 13.3v -15v running.

which engine,? the have up to 3 choices.
rih?
what are the full symptoms,
did you do the full listed 60k mile tune up on car?
sparkplugs,wire, cap rotor/filters? no engine runs right with bad spark
unless it's a diesel.
starts good
runs good or bad hot or cold engine
idle at 800 RPM hot?
stalls> when hot and cold engine
lost of power
bogging
misfire,
learchs>

only stalls , but runs perfect even up hills, at wide open throttle.
fresh gas, or 1 year old?fuel.
can your fast right foot , save the stall, and easily?

ok stalls 101.
1; lost 12vdc to EFI system.
2: lost engine compression.
3: lost spark.
4: lost fueling or floods
there is a simple test for each.
do you want more guesses, or how to do tests.
can do both, but my guessing fails 99 /100 times.

tune it up
do the right foot test. those are always first. on stalls.
always.

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.

engine check light should be on
check theses things
engine timing
idle control valve
TPS
crank angle sensor

sounds like the idle control vale is sticking when it is cold. It is located on the throttlebody right at the air inlet