Hello guys, I had an issue with my 2004 350z where sometimes while driving on 2k-3k rpm the rpm suddenly dropping down to 1k and below for few seconds.
Once that happen I have to shift fast to avoid turning off.
If I dont shift the car just shut off while driving and after that it take 10 seconds or more cranking to start up

Anyone had this before ?

 

My bet would be camshaft sensors

 

I agree with Trav. Most likely cam and/or crank sensors. Scan for codes to verify, then replace with OEM parts. Don’t use aftermarket.
-Icer