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The coil and ingition modules are matched together. If you just replace one or the other things might not work very well at ALL. Also, the coils don't go bad. They are nothing more than wound up wire. Physical damage or running high amps through them till the wire melts together is the ONLY way to damage a coil. Spark plugs, wires, and cap are the only items that would ever need replacing under normal conditions.
A bad coil would be a non start and a bad connector would be a cut in and out. So I advise replacing the ignition module if you're going to replace the coil so that they're matched.
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue 
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