Car not starting

Over the past few months, my car has been intermittently stalling. It will stop moving with electrical still running, and I can restart it again without issue. Now my car is not starting. It does turn over. We have not had a check engine light come on throughout this time, nor any codes come up. We have replaced the fuel pump and crankshaft position sensor. The car appears to not be getting a spark. Any suggestions on what we can do?