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  1. Low Voltage o2 sensors.

    Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)
    I have the 99 Tahoe 5.7 vortec. It’s had a problem with a hard start every time. And sometimes it will throw the code ignition coil voltage high. I changed the module out and still does it. And sometimes it runs rough and will throw bank 1 sensor 1 and bank 2 sensor 1 low voltage. The...
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