Starting problems...

[truhlth]

I am having an occational problem starting my 89 240sx. The engine will turn over fine but just will not start, doesn't even get close. If I push the car and pop the clutch it will start right up and run just fine. Why will it not start with the key sometimes. This is an occational issue and the time of the day or the temperature does not seem to be an issue. I have replaced o2 sensor, plugs, wires, cap rotor, fuel pressure regulator, had all injectors pulled and rebuilt. Still has intermittant starting issue and also occational RPM drops when trying to start out from a stop, like not enough gas is being applied to the throttle. Any help would be greatly appreciated...

:help

[ninjak84]

Alternator.