I have the same prob. as does' another person I wheel with. I just ignore it....I have a 85 with a 22rec. I have put a header and intake on. I have looked at the engine code and it comes back as a o2 sensor. My problem is when im driving at 2 grand for a minute or two my check engine light comes on and when i let of it will turn off in about 10 sec. I have put new o2 sensors in. I dont know if anyone else has had this problem. I hope someone has some ideas.