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there could be a couple of things causing the engine to stall, most common would be a large vacuum leak, check all vacuum hoses under the hood paying close Attn. to the large hose going to the power brake booster,but the most common thing to cause a idle stall is a idle control motor some times it is called an idle air motor.
This sounds like a bad idle air control valve, but also make sure the throtlebody is clean, use a toothbrush and some throtlebody cleaner, spray and clean with brush, make sure to open plate by having someone hold gas pedal to floor, after cleaning if truck still stalls then replace the idle air control valve,
You need to have a scan done and pay close attention to the throttle position sensor and the idle air control .
Also (since we have so little information to work with) check your engine compartment while it is running and listen to see if you have a vacuum leak. See if you hear a hissing sound.
A vacuum leak will cause it to stall after it is warmed up. The computer will keep it running at a higher RPM until it warms up and with a vacuum leak it will stall when the idle comes down to the 600-700 level.
There is a throtle adjuster right behind the carb. You can adjust it with a screw driver. If you are not sure where it is, just have someone press to gas pedal and you will see it move. RPM's at idle should be around 1,000 when it is idle once it has warmed up. Once that car warms up the choke moves back in and the car is probably stalling because it is not running enough RPM's.
sounds like one of the metal arms connected to the engine may be getting stuck some how. have someone get in car and press on gas when car is off while you watch engine to see what is moving, then check those arms to see if there is any possible obstructions or knicks or something on them
change plugs wires also .fill gas tank up put prestone or gum out fuel injector cleaner.drive car around several miles.give injector cleaner time to clean out injectors.wait until engine cool .change fuel filter.relief fuel pressure before changing 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?
Mine was doing the sme thing-run fine then stall. restart in a few minutes and run fine for a while then shutdown. some times give codes o3oo, 1781 and 0700 but not always. I installed a new crankshaft sensor and it solved the problem!