1987 4x2 idling really fast when cold and stalling

lots really,
scan it yet.
no year car told
no country told
answers will be hard, wrong or generic, all not good really.
what does WON"T IDLE mean
idles too fast hot or cold
idles too slow hot or cold.
stalls hot or cold.
does engine make full power hot and cold both?
??????? tell the good and bad or answers will be wrong or wild guessing./

Check the ECM grounds, they are under the passenger side kick panel. When the engine goes to warm status, the Oxygen sensors come on, If there is no ground on the ECM then it starts pulling ground voltage across the sensors and that causes big issues.

stalls. but does is restart, stalls hot and cold engine?
all the time? or just some times, what?
ever do a 60k mile tuneup this decade?
does fast right foot save the stall???????? key question !

1. lost 12vdc power to EFI.
2. if random stalls its not lost compression
3. bad spark (tuneup time?) lost spark , kills all gas engines.
4. bad fueling. too much or too little.
5. if all above is good, then the ISC is stuck closed. lean it.

400k, your lucky it even moves.
really
what does not idle mean? and hot or cold engine or both?????
stalls
below 800 hot.
too fast idle. what?

Hi
This sounds like a cold start system fault, which is a number of things.

1. Cold start temperature sensor not operating correctly so the cold start system won't work when the engine is cold.
2. The idle needs to be set to the correct RPM of the engine when warm, if it is idling ok when it is warm then this wont be the problem.
3. Spark Plugs are worn and need replacing.

Most case's its the cold start system not operating correctly and if you have a good workshop to take it too they should pick this up quite quickly. Hope this helps, let me know how you get on.

I would have a look at your coolant sensor, if it's reading the wrong temperature, it will cause a idle problem. If you can, get a scanner on it to verify it's operation.

Sounds like fuel filter.

I need to get a clear mental picture of what exactly is happening.

With this said, you stated that the car "runs fine" until warmed up.

Q: When you start the car when cold it idles fine?
Q: If you allow the car to idle until "fully" warmed does the car stall?
Q: As the car begins to warm up, Does the RPM fluctuate abnormally?
Q: Does the car Only stall when you press on the gas pedal or does it stall just sitting and idling in addition to pressing the gas pedal?
Q: If you can drive it while cold does the car stall during acceleration when warm or only at Stop Signs / Lights?
Q: If you wait 20min or so, can you start the car again?
Q: How many miles are on the car?

Early Toyota fuel injection use a cold start injector, it only works when the engine is cold. It is located in the intake manifold. for the mean time you can turn up your idle by turning a flat head screw in your intake manifold counter clock wise . It could be a coolant temp switch for the injector that has gone bad also.

Although this isn"t a proper fix, and may affect emissions, I ran accross this problem on a friend's 87 2wd wagon.

There is a dashpot that controls a lever the Idle set screw is on, I am guessing it is a decel valve that closes butterfly when coasting in gear. I never looked at a manual to figure out what controls the vacuum valve that is on the passenger side of the engine compartment, but if you disconect the vacuum line and plug it that lever will not back off and idle will remain where you set it with the adjustment screw.

Make sure the engine is warmed up and not on a fast idle cam before adjusting idle.

The car is a 5 speed, I not sure if automatic cars are the same.

The car idles fine now and still run's great and gets 37+ MPG with 240000 miles!

If you want to fix it properly you would have to diagnose why that dashpot is being actuated at idle