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what causes no spark at plugs on 2004 Buick LeSabre

have replaced crank and cam sensors, have power to control module under coils. I still have no spark to plugs. the engine cranks and has gas to the cylinders. this happened all of a sudden.

Asked by for the 2004 Buick LeSabre
Positve about no fire at all to the spark plugs? How was it tested?
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Coil pack may be bad or the body plate is rusted, no connection.