well I found a small crack in the porcelain of one plug and i was wondering if this would make the plug not work because im having issues now with my ignition and ive tried the coil but thats not it. thanks
The plug would still work but the spark will jump to the header or any other metal object. And the cylinder may not fire at all. I just had the same problem, realized it when I was putting on some new wires. Replace the plug stat.