Hey, I have error codes 8 (AFM), 12 (TPS full range), 17 (Feedback system for O2 sensor), and 18 (TPS narrow). Now I think I fixed my TPS I adjusted it today since it was nice out. The only reason I listed them was just in case those codes may be related to the other codes. Now codes 8 and 17 are the ones I don't understand. I recently did a run on the dragon (deals gap). Would that explain code 17 or 8? I don't understand why the AFM would just go and fail on me all of a sudden. I havn't do any work on the car to merit it to fail. Any help is appreciated. Thanks a lot, Eric.

Edit: Oops sorry I forgot to leave details. My car is an 89 Vert.