 This is our 3rd Expedition and the first we have had problems with despite essentially the same engine. The vehicle has had an intermittent misfire for at least 2 years. Has not shown up on computer until this week when engine light finally came on. Coil on plug on cylinder #4 was faulty. After a check of the internet, I find this is a common problem which was confirmed by my dealer's service department. Ford refuses to acknowledge this is a problem with this engine. Big decision now is whether to sell it or keep it and risk a multi-thousand dollar repair bill sometime in the future. No more Expeditions for us which is a shame because we like it a lot more than GM or other products.