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You were told incorrectly. The manufacturer of the Motorcraft AGSP32PP plug is NipponDenso.uSHOslow:
As far as I've been told Ford uses Bosch plugs.
Yes, I tried a set on my old gl and it ran rough. When I went back for new ones, the guy at the counter told me he got a lot of complaints from ford drivers about it.So I'm assuming Bosch Platinum +2s and +4s are a BAD idea?