2002 FORD CROWN VICTORIA Engine And Engine Cooling Problems

THE ENGINE STALLED WHILE DRIVING, FOR NO APPARENT REASON. DRIVER (MY RETIRED MOTHER, AGE 72) HAD TO GET CAR OFF ROAD AND RESTART CAR TO CONTINUE. THE POWER STEERING DISABLED WHEN THE CAR ENGINE STALLED. THIS HAS HAPPENED MULTIPLE TIMES (2-3) OVER THE PAST MONTH, AND THE LOCAL FORD DEALERSHIP CANNOT REPLICATE THE PROBLEM AND IS UNABLE TO CORRECT IT. ON ANOTHER OCCASION THERE WAS A THUMPING NOISE AND THE CAR SLOWED CONSIDERABLY, BUT THEN PICKED BACK UP AGAIN. THE "ENGINE HEAT/THERMOMETER" LIGHT HAS FLASHED ALSO, BUT THE ENGINE TEMPERATURE HEAT IS NORMAL. I CONSIDER THIS A VERY DANGEROUS SITUATION FOR MY MOTOR IF IT WOULD HAPPEN IN A HEAVILY CONGESTED, HIGH TRAFFIC AREA AND COULD CAUSE A VEHICLE CRASHES. IT IS A VERY STRESSFUL SITUATION.

I HAD BEEN DRIVING 250 MILES OR SO AND DROVE DOWN A LONG WINDING INCLINE, AS THE ROAD FLATTENED OUT I HEARD A NOISE FROM THE ENGINE COMPARTMENT. THE NOISE SOUNDED LIKE A HOLE IN THE FIRST PART OF THE EXHAUST SYSTEM. I FOUND A SAFE PLACE TO PULL OVER AND TURNED OFF THE VEHICLE. THERE WAS A SLIGHT ODOR OF NATURAL GAS AS THIS VEHICLE IS FUELED WITH NATURAL GAS. AFTER THE ODOR PASSED, I OPENED THE HOOD TO FIND THAT THE #2 IGNITION COIL MOUNT WAS BROKEN, AND THE COIL AND SPARK PLUG ASSEMBLY WERE LOOSE IN THE SPARK PLUG WELL. MY INITIAL THOUGHT WAS THE SPARK PLUG HAD LOOSENED AND EJECTED. I ATTEMPTED TO RE-INSTALL THE SPARK PLUG BUT THE THREADS IN THE CYLINDER HEAD WERE INEFFECTIVE. THE SPARK PLUG HAD BLOWN OUT OF THE CYLINDER HEAD. I HAVE SUBSEQUENTLY FOUND OUT THAT THIS IS NOT AN...