Looking to swap my suspected faulty standard NGK spark plugs for some new ones (I suspect they are causing a dip in revs when idling)
I have heard various branded Iridium plugs are good as they burn hotter? Other folks say they dont like them and recommend std GM plugs?
Don't know if I want to get NGK's again as they may be causing the problem. But then again, it might just be a 1 off dodgy plug?
Suggestions would be most appreciated