Ticking in #8 cylinder(1965 mustang)
Recently I noticed a ticking noise when the car was idling rough. By disconnecting the spark plug wire from the distributor cap, one at a time, I was able to isolate the noise down to Cylinder 8. In an effort to troubleshoot, I first swapped the spark plugs wires(#7 and #8). I then swapped the spark plugs #7 and #8. After both of these steps, the problem remained in cylinder #8.
So my question is what could be causing this? I have read a number of different posts suggesting anything from the plug wire going to ground, to exhaust leaks, to very bad internal issues. Of the possibilities, which ones can I rule out since the noise disappears when I disconnect spark plug wire for cylinder 8.
Any ideas/suggestions would be greatly appreciated.