1993 Buick Park Avenue Occasional Starting Problem?

I purchased this car from an elderly woman a few months ago and she did alert me of the issue. The car starts fine normally, but every so often, it cranks but doesn't turn over. Usually after 15 minutes or so, it's ready to start again. I changed the plugs and wires, and when it did this the other night, I found no spark going to the plugs. As I said, it only happens sometimes, and I can't figure out why the spark doesn't go at those times. The alarm was also disconnected or doesn't work, if that helps at all. Thanks for any help!
 
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