Hello, I was curious what type of spark plugs as a OEM for Jazz 1.4DSI? I had a few misfire on engine cylinder number two. I took one spark plug out and find the condition on the head is very poor but is not a Iridium it is normal head spark plug with no trader name on it probably a cheap aftermarket. I guess it have change by the previous owner who don't pay the premium spark plug.
Which spark plug is the best for gain power and better to burn iridium or the triple head spark plug?