i am getting a check engine light that comes on a few minutes after firing it up, but before reaching full operating temperature, then it goes away. it also comes on while traveling 75-80 mph and stays on until i slow down to about 70. my gas mileage seems a bit weak, too. finding an obd1 code reader around here to borrow is a chore, and i need a quick diagnosis. does this sound like bad o2 sensors?
I am not sure about your diagnosis, but do you know about grounding one of the pins on the OBDI port and counting the flashes? I did it to my '93 Ranger and it was a pain in the butt but it does work and you don't need a reader.