I would start with the air pump. And oxygen sensors.
Does the 4.6 have the valvetronic, that might be 27?
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2006 4.8is, Black on White. SOLD Sniff Sniff.
2017 F85 x5m, Black on Red. BEAST MODE
"The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain
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