I have a 1990 300zx TT it has a new motor in it just replaced the oem wiring harness and gave it a 60k maint. installed new O2 sensors and checked all the other sensors to make sure the were good. The motor only has 60k on it FYI. There is a hiss coming from inside the cockpit behind the gauge cluster and on the opposite side of the firewall in the engine bay as well. I checked every hose but they are all attached correctly and there are no leaks. Any idea??? Also there are two wire connectors on the driver side without a connection one is yellow the other is black. This is obviously my first time posting so please bear with me and appreciate the help.
Follow Ups
Help with vacuum leaks and engine hesitation - Fairladyaffair15:26:25 05/17/08