Here are a couple quick pics of an IAC with the port mod sitting next to a stocker and the air die grinder I do it with.
For an elaboration on the o2's. The two white wires on the o2 sensor are for a the o2 heater. Without them working ,especially on longtubes the o2's cool off at idle and slow cruise and stop working correctly and the puter flips out. Use a paper clip or two and check for 12dvc between the two wires. No voltage, no heaters. Ford actually made a change and put the fusible link on the outside of the harness in the early 90's
Jamie