As he title says, what spark plugs is everyone using? I had the NGK iridiumIX pn-tr5ix or 7397 in 5.3. The plugs I just replaced are NGK V Power pn-tr55 or 3951 that had 3500 miles one them. I went with the same plug but should I have gone with he iridium plugs? Which one is better?
Reply With Quote