Originally Posted by
GNs-r-slow
Only problem with that AB is that carbon builds up around the plug and has been a common problem with the plugs breaaking off. Both the 5.4 and 4.6
you're right , but thats from going to 100k on the plugs , and its usually the 3 valve engines that have the long electrode. Ford recommends 100k , I recommend 60. Its not much more than what he has , but those plugs arent cheap