03 Malibu Crankshaft Position Sensor Connector behind alternator

Hi I just got my car running after almost a year. My anti theft light seemed to start my issues I replaced my ignition, fuel pump coil packs plugs and wires purge valve, battery finally ram but kept getting a po300 code. Was gonna try wiring a toggle switch to the anti theft cable before my latest incident. I replaced lower and upper o2 sensors and it started everytime. Enough to get it from back parking lot to in front of my house the the wires came out of my crankshaft position sensor connector. So i rewired it worked.. then after i drove it over the car was running but all the sudden my connector wires came undone replaced the connector but now it wont start at all just turns over still. Not sure what to do next.