[Rotary Evolution]

first i would check the engine before bothering with anything else, just do a compression test and get that out of the way.

if you have a powerFC you can use the hand controller to raise the injector correction % to see if it is just not getting enough fuel on cranking. it will reset to 1.000 when you turn the key off so you won't be screwing anything up. just make a note of starting settings before making any changes though, in case you start dicking with the wrong settings.

the crank sensors usually are not a problem with the powerFC, mainly with the haltech. but poor wiring can cause a poor signal on any ECU so i would check and make sure the wires leading to them are not frayed/broken or that the front main seal has filled them up with oil. if the tach is bouncing on crank and the PFC is reading RPMs you can probably eliminate this as a possibility.

a faulty leading coil will also make the car very difficult to start but you would also notice a huge lack of power at all RPMs.