Gezz, just replace the wires already.... You might need a coil, but I'd bet against those wires. I suggest either AutoLite Professionals or OEM Motorcrafts, not the Ford racing ones.
Secondary misfires are going to be in the secondary ignition system.
The tech didn't want to get into it because he saw it as a no win situration. It wasn't a straight-forward repair that he could make and move on to the next job.
Diagnose the fan problem separately.
You can replace the PCM, but I'd suspect it is a waste of money and time.
Steve
