I posted a thread already but didn't find an answer but would you know what would cause my g37x coupe to all of a sudden shurt off and restart several times while driving

 

So you post another thread???? Fail

 

Get a multi-meter and test your alternator. Should be somewhere around 13 volts.

I'm having the same problem when starting the car, sometimes the rpms will shoot up and plummet to almost stalling the engine. Have to throttle assist most of the time.

If the alternator isn't the cause, check your MAFs or Throttle Bodies.

 

I actually posted that thread by mistake I didn’t mean to have two. The alternator was replaced already so I know that’s fine so my next step to change my crankshaft and cam shaft sensors