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Robert, You may have to try this relearn procedure. Warm the engine, but hold your foot on the throttle as necessary to keep the engine running.
With vehicle in Park, slowly release the throttle so that the engine will idle on its own. You may have to work at this a bit.
Let the engine idle on its own for about one minute.
Continue to let the engine idle and with your foot on the brake, place the transmission in Drive and let the engine idle for another minute.
Continue to let the engine idle with your foot on the brake and the transmission in Drive. Turn the A/C on and let the engine idle for another minute with the A/C compressor running.
Turn the ignition off and wait a minute. Check the attached links,
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these trucks are equipped with an idle speed control motor. What you're describing sounds like that part has stopped working. The part is designed to maintain idle when gas pedal is released. Now if you hear an audible hissing noise under the hood, then theres a vacuum leak which can cause the same problem, but it sounds like the idle control motor. Good luck.
an alternator won't stall your car, the battery provides power to keep the spark going. It sounds like you could have some bad fuel, if you're able to run the throttle manually with your foot and keep it going that would indicate idle control. but if it stalls still when you are giving it gas. I would guess a fuel supply issue, either water in your gas, or fuel pump. Good Luck.
Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.