I have an 88 turbo and it just started running super lean the other day. I have the regular gauge, so obviously I can only say really lean instead of a certain a/f ratio. However everything on this engine is new, it holds perfect fuel pressure, the afm is new and good, and I have a knock code. No other codes. The knock code was making it run super rich which didn't really affect the driving much, but then the car starting run super rich out of no where and I can't figure it out. I even checked to make sure the injector wires were good. I know the ecu is telling the injectors not to open. I just don't know why. Can anyone help? Could it be the injetors' resistor pack and if so where is it at?