You stated: " I start it with a push button switch, and there is a immobilizer, but its not connected. Is there a way to jumper it?"
No there is no way to jumper the Immobilizer, if it is not hooked up then this is why it won't start.
You stated: " How does the PCM receive signal from the immobolizer?"
The Immobilizer sends a signal to the PCM over the Bus Communication network (PCI Bus).
You stated: "or do you know if any neons that dont have the immobolizer?"
Yes, there are Neons that are not equipped with the Immobilizer System.
You stated: "and sorry i do have spark, car runs with gas down the intake"
Good that eliminates a lot. From everything you describe, the fuel system is disabled due to the immobilizer. Immobilizer does not disable spark, it only disables the fuel system and that is why you don't get injector pulse.
To fix this you will need to reconnect the immobilizer module, reinstall the ORIGINAL PCM (ECU) and you will need to use the programmed chipped key in order to start it...
Keep me posted and let me know if you have any additional questions...