P0306 Ford - 2012 f150 Eco boost

Question

P0306, p0305, p0303 changed out spark plugs but codes still showing. What could be the issue?

Answer 1

Hi there,

With it misfiring on so many cylinders, I would suspect a possible issue with an intake manifold gasket leak or low fuel pressure. The coils are possibly the issue, but so many like that I would look at other items first.