Originally Posted by
huntz0r
Those aren't three error codes in the pic, it's a "1-2-8" error code. Page 11-53 of the '85 FSM lists what each combination means. (The "1" lit up alone is indeed an O2 sensor problem, but that's not your code.) For 1-2-8 it says:
Possible cause:
-Disconnected idle mixture adjuster sensor coupler
-Shorted or disconnected idle mixture adjuster sensor wire
-Faulty idle mixture adjuster sensor
Symptom:
-No particular symptom shown
-High idle speed
It may be your symptoms are another problem on top of this, but it's a place to start. Are there any other code combinations?