I have had my ecoboost for a couple months now. Overall I am very happy with it but I have noticed a shudder recently when accelerating and when coming to a complete stop at times. I only feel it when accelerating from a stop or when stopping completely. Kind of feels like something slips. I think I recall reading about this before on the 2011 and 2012s somewhere.

What is causing this and is there a fix or is it just the way these trucks are?? I can deal with it but it is kind of annoying when driving in traffic.

 

Try gaping your plugs .032-.034". Some are experiencing plugs gapped all over the place to over .044" and very tight instead of the 133 inch lbs. Easy to accomplish just don't touch the center electrode, iridium and easily damabed. Looking black outside and orangish middle is common. It may also increase mileage.