I have a 2011 G37xS I am lost as to where to go from here. I had a P0335 code the car started running horrible then one minute later won't run at all. Replaced the crankshaft position sensor. No difference. Replaced the camshaft sensors. No difference. Replaced the crankshaft sensor two more times all OEM still no difference. The car will spin over and fire a time or two and not start. I measured the voltage at the plug and they seem fine. When cranking over a scan tool shows rpm so I know ots reading. I just Replaced the flex plate and still same issue. Does anyone have any idea where to go from here I am completely lost. Thank you for any help

 

Here is what the FSM states:
• The crankshaft position sensor (POS) signal is not detected by the ECM during the first few seconds of engine cranking.
• The proper pulse signal from the crankshaft position sensor (POS) is not sent to ECM while the engine is running.
• The crankshaft position sensor (POS) signal is not in the normal pattern during engine running.

Probable Causes from the FSM:
Harness or connectors
[CKP sensor (POS) circuit is open or shorted.
(APP sensor 2 circuit is shorted.)
(EVAP control system pressure sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(Brake booster pressure sensor circuit is shorted)
• Crankshaft position sensor (POS)
• Accelerator pedal position sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor
• Brake booster pressure sensor.
• Signal plate