Stock motorcraft spark plugs are the best. Careful on the removal of the old ones though. They tend to stick and break off in the heads on the late 90's to 2004 models. The dealership has a tool to remove the broken off part, but worst case scenario is to replace the heads if you can't get it out.
Take some penetrating oil to it for a while before attempting it.
SPONSORED LINKS
Sunday, June 10th, 2007 AT 2:12 AM