After numerous questions on how to wire the IAT, timing pull trick.
Here is some additional info for the schematic posted earlier.
For years 1999 and 2000, and C5s these are the wires your looking at:
On the PCM Red Connector,
#25 Tan wire
IAT Sensor
#57 Purple wire
IAT ground
So for this diagram,
Tan wire would go to "A",
and purple wire would go to "B".
Now I am not sure if these wires changed in latter years, or prior years (but think at least prior years are the same), but a PCM pinout can be had for any year, if ya do your home work. I haven't used this or messed with it for a few years, so...
Anyway, I hope this clarifies some of the wiring for this trick. Oh and a 750 ohm resistor will pull about 3/4 degrees of timing.
Robert