We used to have a 2002 RV with the Ford chassis and V-10. I had small problem that showed when going up hill. When the engine was under load and still in a higher gear and the RPM was still low, I could feel a slight miss in the engine that was not there before. My wife didn't notice it, but I did but again only when the engine was under the additional load of slightly going up hill. The miss was caused by one bad ignition coil or COP. Googling the problem it was recommended to replace all 10. I found a recommended seller on Ebay selling all 10 new COP's for under $200. This solved the problem and the V10 ran perfect again.