Hello I have a 1990 tt 300zx and a 1990 NA 300zx. The TT has been giving me some problems when driving at faster speeds. It tends to drop in RPM at idle when the engine is warm and it will stall out. Nissan could not find any mechanical problems so I'm thinking there might be an electrical issue with the car. Any help would be greatly appreciated. here is a picture of the TT.