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Additional question on 97 Tbird 4.6 V8, I used a timing light to check plug firing, they were all misfiring but one, pulled plugs, all were fouled, dry black deposits, these were Bosh platinum.
Apparently Bosh ddnt figure out the right heat range for the 4.6?
Regaridng putting only Motorcraft plugs in, these are 5 bucka apiece compared to other brands which are 3 bucks per,
I used to use only autolite plugs even in chevies, would these be as good?
I bought a manual which states to put only AWSF-22PP plugs in this engine, is that the current best plug?