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Hi, usually a large leak develops in the vacuum lock circuit and it depletes the vacuum to the shut off valve. Try locking the car and waiting a minute then see if the car shuts off. If it does you will need to locate and repair the leak in the door locks. You can also block off the yellow vacuum line for the door locks at the brake booster and see if the car shuts off. The brown lines are for the shut off. Sometimes the rubber vacuum hoses on the vacuum switch on the steering lock fall off and cause this problem as well.
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