I ran the KOER test on my 90 5.0 and I got codes 21, 94, 44, and 18. I know that 94 and 44 are due to my smog equipment being removed, but 18 and 21, I don't know too much about. From my understanding, the SPOUT circuit being open means I'm running at base timing. So can I just get a new SPOUT? What's this thing even look like? And about the ECT being out of self-test range...what's that all about? Also, on the KOEO, I got code 13 which says that the ISC did not respond properly. What can I do about that?