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I have not read my manual on this subject, but automatic transmissions have what they call, a neutral safety switch.
The switch prevents you from starting in gear, similar to our manual transmission requiring a depression of the clutch.
Usually the switch prevents the car from cranking. over, you said your car was cranking over, maybe it was a modification of that switch that allows it to crank but not spark.
I will check my manual and get back to you.
I encountered this problem one time back in 1975, so it goes to show you it does not happen often.
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