Greetings franklin2. I'm jumping off the original thread that you responded to my question. I didn't want to highjack that one. It was on the BroncoII 2.9 code 18. I checked the timing and it was fine. I cleaned up the bare ground wire from the TFI and the code 18 went away. I had recently replaced the TFI with a Duralast. Should I test the old (original) TFI to see if it's actually okay?