ON I-10 at 75mph I heard noise from engine like a backfire and motor died. on 2002 Toyota Tundra

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I found the #6 coil pack burnt all plastic off and windings were in spark plug area. Truck has power, no blown fuses but still want start.
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I have not had a problem with this motor till now. Nothing lead up to this so that's why im lost to what it could be. Its at the shop now but no answer yet. Thanks
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