i am a relatively new z owner and i am wondering if this is something that any one else has heard of. my 280z has been dying out at wierd times and with increasing frequency. the problem used to be limited to when i was driving the car hard in fifth. the engine would just cut and i would have to pull over. the wierd thing is that i would only have to let it sit for about a minute and then it would come right back. recently though it's been dying with a sputter and occasionally a puff of white smoke when i'm cruising in third or sometimes when i put it in gear at a light. now it takes 10 or fifteen minutes to come back but when it does it runs really smooth for another good chunk of time and then dies again later. i had somebody take a look at the fuel system and they said the pump, filter and injectors are all good so i am thinking it's electrical. any idea on what this could be or how to tackle this?