I have had some trouble for a couple weeks now with my ‘06 g35. It started when i was on the highway when it started to jerk while driving but i made it to work ok. A few days later I went to eat and when i left the car would start fine then shut off a couple seconds later. It then periodically began to jerk every once in a while and want to shut off. It sometimes did stall out completely. Also, the same problem where it would start fine, no delay or long crank, then shut back off. Any suggestions on what it may be? This is a video from this morning but it usually stalls out quicker then this! It has thrown a few check engine lights when it happens sometimes but in order to get it started again i have to do ECU reset which usually clears the light so i haven’t gotten a chance to get it read yet. (Video is sped up in order to be able to upload it)

 

You really need to get the codes to be more confident you'll get the right part and not waste your time and money guessing the wrong parts. Could be crank sensor. Could be other ignition problem. When you made that video you should have pulled the code before you started it.