Bought a 2003 745LI about 6 months, 160 K miles. Hands down the finest driving auto I have owned in 5 decades. Anyhow, the dreaded has happened. Punched it from a dead stop to 60. Almost immediately it developed a misfire. 2 different shops read an error code P1347-misfire cyl 3 w fuel cut-off. The Auto Zone print out suggested an ignition coil. I have ordered a set of plugs. I don't know how long the current ones have been installed. Before I order an ignition coil has anyone been down this road or have a suggestion? Also, should I replace all the coils? Any help appreciated.