ok i keep getting the check engine light on at random times, it will be on for a few seconds then turn back off, hooked it up to a scanner and could only find code 179 "system at lean adaptive limit; system rich" what can cause a fuel system to be rich? was thinking about the O2 sensor but would like to know what else could cause that before i go out and buy a new O2 sensor, and also seems to have poor mileage even for a truck.
A Quick reply would be very helpful Thanks