The Nissan 300zx EFI/EGI wiring harness is the harness that connects to your ECU and receives signals from all the sensors and connectors on the engine. Over time the connectors get brittle and break causing bad idle and poor performance. It is strongly recommended to replace this harness anytime the engine is out of the car.
Some of the harness's are no longer available:
1994 TT Automatic
1995 TT Automatic
1994 N/A 5 Speed
1994 TT 5 speed <-- Can order a 1995 harness and splice in 90-94 style injector clips
These harness's have to be special ordered and can take a week to several months to get. Please order early or call for availability for the harness you need