92 D21 vg3.0
All of a sudden this morning my truck started missing. Its running rough. The chk engine light is now solid on where as before it would only come on going down big hills.
How do I read codes? I went to the auto parts and they only have a 2nd gen code reader.
I looked under the seat and I see a solid red led light bulb in the computer unit facing driver thats it.
Going to do full ignition tune -up this weekend (plug wires, plugs, cap, rotor) I guess I should put a new fuel filter in also.
Id like to see what the computer says. How to I check it out?

does this help?

https://www.2carpros.com/articles/nissa ... 84-to-1994