I have a used 96 chevy blazer. It wouldn't start one day,so i went through my electrical check list. I checked the distributor,coil,wires,and then I checked the spark plugs and all of them I checked had 2 electrodes.my question is do I replace them with qith 2 electrode or single electrode spark plugs?

 

Single electrode.

 

Ok but out of curiosity what difference if any does it make?