1986 Nissan D 21 Fuel Problem

At the injector harness on the throttle body disconnect it put a test lite on the red and white wire do you have power?

At the computer connector while connected check for power at pin 114-no power there you have a problem with the computer

Also do a continuity test on the red and white both end disconnected- O reading wire is good and infinite/needle don't move you have an open wire on the red and white. Note do the same with the ground wires black by itself and a black and blue-you should have the same reading with the red and white wire.

Hope this helps