I have an 87 300zx that I'm trying to get back to how it was performance wise off the lot before making further mods, I was wondering what are a few things to do and to diagnose with the Z31 specifically? Also I the person before me tried a radio install and now the radio doesn't work but the speakers still have the static sound produced so I believe the circuit for the radio still has power but not sure on how to get the radio to start working again. Any information helps a lot as I'm still learning about cars in general!