1994 Geo Prizm Question: Intermittent starting difficulty

Where does the fault lies in my ignition system? Turn the key and the car always cranks strongly. Normally, the car starts readily. Once started, it always runs perfectly. The problem? About 15% of the time when I turn the key and the starter cranks, it won't start the engine (it is not a flooded engine issue). I open the door and give the vehicle a short push (standard transmission), hop in, pop the clutch and away I go. This means I always park my vehicle with the perspective that it may need a push start. Ignition control module or some other component? Thanks