Car cranks, runs, but won't start - push only

So, out of no where, my engine won't start now. It cranks, but won't start. I got to the track yesterday and had to push start the car the rest of the day. The engine runs fine, there's just something not letting the engine start. I did get crank position twice from about 20 or so failed starter cranks. Since I just did timing and checked everything, and replaced the sensor, I'm gonna shoot wires and shake the harness. Anything else stupid sensor related that can cause is needed to start but not run? Like the neutral switch or something? 2.5 manual.