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I can't find a P1607 code, but a P1667 indicates a problem in a circuit between the PCM and IDM. You might check the IDM to see if there's water in it or the connector is corroded.
I doubt that your issue is with UVC harnesses.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, 6spd, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, Jody's 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check here
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