#3 SPARK PLUG BLEW OUT OF THE HEAD. FIRST HAPPENED IN 2004 FORD SERVICE ACTED LIKE HE NEVER SAW IT BEFORE AND DIDN'T KNOW A SOLUTION . I HAD A HELI COIL INSTALLED, IT HAPPENED 3 MORE TIMES BEFORE THE LAST TIME, I HAD ALL PLUGS HELI COILED .WELL WHEN #3 BLEW OUT AGAIN ON 4-14-07 AND COULD NOT BE REPAIRED AGAIN. I WAS TOLD THE ENTIRE ENGINE SHOULD REPLACED AS PREVIOUS PROBLEMS HAD CAUSED EXCESSIVE CYLINDER WEAR. IT WAS BEING DONE TODAY. TOTAL OUT OF POCKET $ 7,000 PLUS 16 LOST DAYS OF WORK RENTAL FEES.*AK