Q: Car shuts off unless the gas pedal is applied

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I went to the mechanic because the car keeps shutting off. I was told that when I release the key, only 12 volts is being discharged by the coil. I had the fuel lines and the gas tank flushed and cleaned. He overhauled the carburetor as well. The car keeps cranking on start up for a long time. This makes the battery drained. I'm able to start the car. However, it would shut off very soon afterwards unless I keep applying the gas pedal. The car would shut off if I'm at a traffic light, or slow down to make a turn as well as when changing gears. What could be the problem?

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