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?
On the D21 series pickups with the 2.4 L 4-cylinder (maybe the Frontier as well), the bypass connector is located under the throttle body assembly. It is hardly visible from either the top or bottom...
there are certain special bypassers you can buy from special automotive stores.