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Let's call the loose battery cable a fluke and not part of the problem.
Is this the 4.3L engine? If so, there have been very strange problems involved with the two-wire connector that plugs onto the coil. The next time it won't start have someone crank it while you apply pressure in all different directions to the wires going into that connector.
Another problem has surfaced in the inline connector that feeds one of the "black boxes" but I can't recall which one.
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