[kach22i]

I'm surprised no one has mentioned the damage pulling on the wires can do by breaking the carbon filaments. Removal done right by pulling on the boot with a very slight (not too much) turn or twist is fine. However, a fresh set of wires when installing spark plugs would make this a moot point and insure a damage free wire set.

Light show: On the darkest of nights, open the hood and run the car. If you see a light show of arcing light (look very carefully) it's time to replace those bad wires.

My 13 to 33 year old cars get solid copper NGK spark plugs.

Nine years ago an idiot mechanic installed a fancy type Bosh spark plug in my 1977 Porsche 911 with terrible results. This same idiot also put synthetic motor oil and synthetic gear oil in her. Big mistake on all counts, it leaked like crazy and shifted like carp.

In addition they messed up the ignition timing and installed oil return lines which kept dripping oil down on to the heat exchangers until I figured out the source and fixed it myself.

The best thing you can do for your car is to do the work yourself, or at least not take it to an idiot, a fraud and a poser.