I cleaned the resonance valves this weekend when I had the intake off. This is when the problem started. They are free and flapping nicely. We fuel up at the same station every time, it is chevron and they have a large turn over in fuel so I know it is fresh. Now as far as the EGR transducers I have not fooled with them how are they checked?
2006 E350 98K miles
2013 Ford Explorer 15K miles