If there is only 8 volts to the coil, that is your problem. There should be battery voltage (12.2) volts to the coil with the ignition switch turned on. Connect a voltmeter between the DARK GREEN/BLACK wire at the ignition coil and the POSITIVE battery post. Turn the key on. If the volt meter reads more than 0.3 volts then you have a voltage-drop (high resistance) problem on your coil B+ circuit. The coil is powered by the Auto Shutdown (ASD) relay - this is the MOST LIKELY source of high resistance in this circuit.
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