I have a 2010 Ford Taurus Sho that the number 2 cylinder misfires under boost. We have replaced:
PCV breather assembly, PCV valve and heater, all six spark plugs, Cylinder 2 twice, all six coils, all six injectors.
Cylinder two is showing 12 to 15% less compression than the rest, vehicle does not misfire at idle but misfires under boost on cylinder2.
Any ideas where I should look next?