Mine will occasionally start and run extremely rough when it does. As far as symptoms, I had sputtering, loss of power, and hard starts prior to mine breaking down. Uploading a video now of how it's running.

 

 

That's weird. You should run the code and see what comes up. Pull your plugs and see if they're fouled as well.

 

SES code was 0603, and that's just from having the negative battery terminal unhooked for too long because it was transported across country while I moved.

Anyway, I already replaced the spark plugs with NGK Iridium IXs
This is my diag thread: https://g35driver.com/forums/engine-...wont-idle.html

Guess what? I had taken it to the dealer, and they're gunna charge me $470+ to replace the fuel pressure regulator. -_- & they said that they don't even know if that's gunna fix it.. I'm irate. I can throw parts at it all day! That was next on my list! ****