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When you start your car, the starter is drawing the battery voltage available to the rest of the car down a few volts. This reduced voltage would make a could that requires full battery voltage weak and unable to provide enough spark to start the engine under some conditions. So what is done is that while the starter is being run, the full (but reduced) voltage is provided to the ignition coil. When you let go of the key after starting the engine the coil then receives a reduced voltage through a ballast resistor or wire, which is great for a coil that is designed to operate on a reduced voltage rather than a full voltage coil. If this is your problem, you would want to check this ballast resistor circuit, which could be anywhere from the ignition switch, the ballast itself, or a connection in between.
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What would cause my VW golf to cut out whist driving
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absolutely
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