try checking the gasket around the intake that should fix it
yes
If they both have the same engine.
it will fit properly if you sawp out the headlights and front bumper from a 87-89
Yes
fddd
Answer On the passenger side behind the kick panel....
In a 1988 Ford F-250, the engine control computer (ECM) is typically located under the dashboard on the driver's side, near the steering column. It may be mounted on the firewall or just above the accelerator pedal. Accessing it usually requires removing a cover or panel to reach the unit.
1985 - 1988 Nissan Maxima is the only other Nissan model with power window motors that will fit a 1986 300ZX.
http://www.autopartswarehouse.com/details/QQNissanQQ300ZXQQPrestoliteQQSpark_Plug_WireQQ19871989QQPRP176008.html Best bang for your Buck .
check vacuum lines top passenger side rear of engine
dont....just replace it..its safer........
Nistune. Romulator are two of them you can use to reprogram a z31 ecu.