95 cav 2.2 intermittent spark

i have a 95 cavalier 2.2l and sometimes it will run fine and then there is no spark all of a sudden. i had it running for an hour or so last night and it was fine, then this morning no spark (it was kinda damp). i have changed coil packs, ignition module, plugs and wires. someone told to try the crank sensor. will they cut in and out? can anyone help me? i need to get this car running because my 02 sunfire is ripped apart getting a turbo right now.

The crank sensor is a common problem.