My 300zx runs on when the ignition is turned off Why
Timing is off. I would change the timing belt or at leas check it
there is also the possibility of a bad ignition switch.
Its not than likely your ignition switch where you out the key in. Is it all jacked up?
Looking for a Used 300ZX in your area?
CarGurus has 125 nationwide 300ZX listings starting at $3,995.
Search Nissan 300ZX Questions
Nissan 300ZX Experts