Percolation? Heat soak? Don't drive during summer??

Yes... It felt like the wire was a little loose in the boot, so i just taped the end of it to hold it in place. There aren't any cuts, burns or marks on the wire the tape just holds it still. I could probably take it off and the wire would be just fine, I just put it there as a "precaution." Maybe I should invest in some fancy wires... I liked the yellow accel wires a lot, the blue napa wires are just OK.
Most likely has the wrong boot on that end of the coil wire ,i.e. 9mm boot on a 8mm wire. If the wires are in good shape just source the correct boot.
I like/use MSD wires they come in black or red.