I have a FAST EZ EFI system with a bad sensor on the throttle body. Keeps giving O2 sensor code. Yes I did replace the o2 sensor. Asking $600.00 OBO shipped to the lower 48. For an extra $100.00 I send a FITECH fuel command unit. FYI. My father-in-law has the same system on his 84 f150 and it runs great. Swapped the harness and computer and no change. Put this throttle body on the ford and got the same code. Must be a bad sensor on this throttle body.