I have SPEC 6 puck. It did take some getting used to. But now, it's okay.
If someone new drives they'll stall a couple times before they get it right. :D
Their was a wright up in MMFF a couple months back on a guy who did this. I don't think it got too tech. on the details but they did have some info/dyno #, etc.
What kind of air filter are you running?
My Expedition came with a stupid K&N charger system and I got that very same code. I only bring it up cause it also has the 4.6.