OUR 2007 F150 INTERMITTENTLY LOSSES POWER UNDERLOAD, STUMBLES, BUG DOWN AND STALLS. WE HAD A VERY HORRENDOUS EXPERIENCE THE LAST TIME IT HAPPENED WE ALMOST GOT WIPED OUT BY AN 18-WHEELER TRACTOR BECAUSE OF EXTREME DIFFICULTY MANEUVERING BACKWARDS DOWNHILL WITH STALLED ENGINE, NO POWER STEERING, NO POWER BRAKES. OTHER DRIVERS WERE SO IRATE BECAUSE WE BECAME ROAD HAZARD AT THAT MOMENT IN TIME. MY HUSBAND KEEP ONTRYING TO START THE ENGINE AND LOTS OF SMOKE CAME OUT OF THE DASH. HE IMMEDIATELY OPENED THE HOOD AND ISOLATED THE BATTERY. A CERTIFIED MECHANIC RECOMMENDED THAT WE SHOULD ADDRESS THE IGNITION SPARK PLUG PROBLEM DUE TO THE SYMPTOM AND MILEAGE OF THE TRUCK. WE THEN FOUND OUT THAT #4 FIREWALL-PASSENGER SIDE SPARK PLUG WAS BROKEN (SPECIALTY TOOLING ROTUNDA AND CAL CANNOT REMOVE IT). GOT LUCKY ON THE OTHER 3 SEPARATED ONCE THE TOOLS MANAGED TO REMOVE THEM. IT NEEDS $1000-$3300 TO RECTIFY THE DAMAGE DONE BY THE BAD PRODUCT DESIGNED MOTORCRAFT SPARK PLUGS. FORD DENIED HELP ON POTENTIAL REPAIR BILL DUE TO WARRANTY LAPSE. THE DEALER RECOMMENDED NOT TO NEED ANY TUNE UP EXCEPT FILTER/OIL CHANGES PRIOR TO 100,000 MILES. AT THE PRESENT WE GOT ROB OF OUR ONLY "RELIABLE?" MOBILITY.HOWEVER FORD CREDIT KEEPS COLLECTING FROM ME TO PAY FOR A DEAD HORSE. FORD HAD FULL AWARENESS OF THE CANCER IN THESE SAID ENGINES BUT FAILED TO NOTIFY THE F150 OWNERS. FOR THE SAFETY OF BOTH MOTORISTS AND PEDESTRIANS ALIKE, DOES THIS VERY SERIOUS DRIVEABILITY PROBLEM WARRANTS AN IMMEDIATE INVESTIGATION AND R