Like Blaine B. I have often wondered what the difference is between the Champion standard and the truck plugs that are so often recommended. Not questioning, just curious.
The PO of my '93 gave me a set of Bosch platinums he hadn't gotten around to installing. Not realizing the 4.0 "simply will not run" on these, I dutifully installed them after a month or so. I continued to get 20 mpg highway and no problems for four years now. I have a set of OEM recommended Champions to install and will expect my mileage and performance to improve considerably (and will be the first to admit it if it happens). In the meantime, I seem to be one of the apparently few exceptions that proves the "rule" about the platinums.