My 2002 EDGE with just shy of 150K on it is having the same issues. Cylinder misfire codes #4 and #6. Flashing check engine light. Motor still runs fine, just a misfire at idle, and under load sometimes. Replaced coil, plugs, wires, fuel filter, seafoamed the motor, and switched to synthetic motor oil since I've owned it. Once it's paid off (by the end of the year) I may throw a set of reman heads, or a new long block at it. Depending on what kinda deal my work can give me. The benefit of working at a Ford Dealer.