2002 Jeep Wrangler Will not start sometimes.

My 2002 JEEP Wrangler will not start half of the time.

Is it cranking over and will not start or just won't crank over at all/nothing??

It will not turn over. All of the dash lights and gauges are on but will not turn over. One time we rocked the Jeep back and forth to get it to start.

Do below:

Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor /distributor pick-up coil, ignition control module, ECM,Ignitor camshaft and crankshaft sensors- Note: If it doesn't apply disregard it