If you change the oil every 10tkm (6tml), never; or if its noisy, meaning the tensioner is not doing its job (probably due to neglecting oil changes)
call Nissan and give them the vin number which should be somewere near the firewall.
electronic control module.
maybe ur clutch is worn out, what exactly happens when u try go?
its controlled by the button on the side of your gearstick (auto).