Mystery shudder

I've tried numerous brands of spark plug wires. Really like the feel of the Taylor's I installed a few months ago. I have maybe 300 miles on them. Time will tell but they feel and look like a quality wire set.
They are.
Had them running for over 15 yrs .
Msd are okay too except the boots rip and gouge too easy. Always the 1st place I look with an msd wire ..is the boot.
I've found the 135 degree boot Taylor spiropro is my fav for headered small block dodge.