Why would a 87 Chevy Celebrity have no spark?

Reasons why a 1987 Chevy Celebrity might not have a spark:

1. The crankshaft position sensor has failed.

2. The ignition module has failed.

3. The engine computer has failed.

4. There is a wiring problem.

5. It could also be failed coils, but I would not expect all three coils would fail at once.