Car is not running right. Rough idle and misfiring under acceleration.

Quicksilvers

I had this almost same problem with one of my last Z’s. The culprit could be faulty ignition coils and/or a possible vacuum leak. I would test your ignition coils and check for any vacuum leaks. Also replacing spark plugs in your Z by time or current mileage is a better rule of thumb never wait 100K miles to change your spark plugs as Nissan would recommend. If you have to change your coils you mite as well replace your spark plugs since you will be in there anyway. Best of luck with your diagnosis.