My car doesn't start after a few days and the window gets stuck. Could this have to do with the security?
Sounds like it might be the battery, I'd check the battery first. If the battery is okay but the window keeps getting stuck, it could be that the trim is wrong or the motor needs to be checked (assuming you have a electric window) If neither are the case, it might be a fuse / bad relay / bad ground...
Search Nissan 300ZX Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Nissan 300ZX Experts