2003 Ford Expedition XLT 4.6L 4WD. 70k miles. Engine has slightly rough idle after warming up. Accelerates fine, MPG's seem about same. I cleaned MAF with CRC MAF sensor cleaner. Changed all spark plugs (properly gapped, .054). Removed throttle body and elbow and cleaned them, replaced gaskets. Replaced PCV valve and tube. Removed and cleaned IAC valve and EGR valve, replaced gaskets. No CEL codes. Also replaced fuel filter. Still idling rough when warm. Any suggestions???????????????????