Only ways I know of:
1) Check the resistance across the plug wire to see if it's in spec. Even then, if you're getting a "leak" the spark is getting used up before the plug.
2) Get hold of ONE(1) good plug wire long enough to reach all of your plugs. Replace each of your plug wires one at a time & run the car to see if the problem comes back. If you're getting busted plug insulators, you know which ones to check first...
