05 Crown Vic PI won't crank

I have an 05 crown vic PI, and it occasionally won't start while in park. When I turn the key, I usually
get nothing, but sometimes it roars to life as normal. It always starts in neutral. Battery and fuel levels are within normal limits, so it shouldn't be a battery problem. Any ideas? Similar problems? Thanks all!

Could be a bad wire going to your starter. Or, it could be the starter itself.

If it always starts in neutral, then it is the circuit that tells the car that it is in Park and that it is ok to start. Maybe called a safety switch. Jiggle the shift lever and see it it starts then. Probably a loose connection or dirty contacts. Could also be in the LCM or Lighting Control Module, which controls a lot more than just lights...