so the issue i am having is a really rough idle, a few days ago it started after i started the car up one morning. it is so rough that it shakes the car at lower rpms. To best describe the sound it would be a brap brap brap with a pause between each brap if that makes sense.

car make is 1989 nissan 240sx OBD1 so its a pain.

yea, old cars have basically no real data you can analyze. On that old thing, first make sure dist cap rotor spark plug wires and spark plugs are good. If they are, try this video as injectors often clog up