What would cause this?

[ChronoGN]

Well, I'm still trying to figure out what is causing the mysterious misfire that happens after 180degrees coolant temperature. I was replacing the spark plug wires today and found something weird. The spark plug terminal on the coil for the passenger side cylinders were rusted(Cylinders 4, 2, and 6). The terminal looks good for the other cylinders but the coil terminal for the passenger side are all rusted and corroded. What could be causing this? Should I replace the coil and see if that would fix the misfires?

[vampyr]

I have had the same problem in the past with the same symptoms I would probably replace the coil and wires and when you put the new wires on use some dielectric (sp?) greese inside the boot and it should solve the problem and keep it from happening again

[V6viper]

If the misfire occurs when the temperature rises, chances are it is somewhere where there is voltage. The wires don't heat up all that much, and the plugs heat up too fast since it doesn't misfire until 180.

My bet is that is the ICM (Ignition Control Module). Remember that heat agitates voltage. Pull the ICM and run it up to autozone and have them check it.

Make sure to have them check it about 10 times in a continuous row to raise the heat. It will pass the first few times but you'll be surprised when you start seeing the red lights flash after a few minutes.