2011 TOYOTA AVALON Engine And Engine Cooling Problems

I WAS ENTERING INTERSTATE HIGHWAY 80 FROM AN ON RAMP WHEN THERE WAS A LOUD NOISE, FOLLOWED BY WIND NOISE AND WITHIN A SHORT TIME A SNAPPING TYPE OF NOISE FOLLOWED BY QUIET. I STOPPED AN ON INSPECTION FOUND THAT THE LEFT-SIDE PLASTIC UNDER-ENGINE COVER HAD FALLEN OFF. WITHIN A FEW DAYS THE RIGHT SIDE PANEL STARTED DRAGGING ON THE ROAD AND HAD TO BE REMOVED. I HAD BOTH REPLACED ABOUT A MONTH LATER. THREE DAYS AFTER THE REPLACEMENT WHILE ON BY WAY TO THE AIRPORT AND PASSING A SEMI TRUCK THERE WAS A LARGE CRACK NOISE AND ONE OF THE ENGINE UNDER-COVERS SKIDDED FROM UNDER THE CAR AND WENT IN A DITCH. I HAD THAT PANEL REPLACED ABOUT A MONTH LATER (MARCH 6, 2013). ON JULY 13, 2013 THE LEFT UNDER-ENGINE COVER STARTED DRAGGING ON THE ROAD AND I HAD TO PULL OFF, FORTUNATELY HAVING A TOOL THAT I...

1/7/12-12:30 AM I WAS STOPPED AT A RED LIGHT. MY FOOT WAS ON THE BRAKE. SUDDENLY THE MOTOR BEGAN TO RACE. I STOOD ON THE BRAKE PUT THE SHIFT INTO PARK AND TURNED OFF THE IGNITION. AFTER A SHORT PERIOD ( ABOUT 30 SECONDS) I TURNED THE IGNITION ON AND EVERYTHING WAS NORMAL. 1/10/12- I CALLED THE DEALER AND THEY GAVE ME AN APPOINTMENT . BUT THE EARLIEST WAS AT 8.30 ON 1/17/12 FOR WHICH THEY CONFIRMED BY E-MAIL. ON 1/12/12, (5:15 PM), MY WIFE PULLED INTO A PARKING SPACE IN A SHOPPING AREA. SHE CAME TO A COMPLETE STOP THEN APPLIED THE BRAKE AND SHIFTED INTO PARK. SUDDENLY,THE MOTOR RACED AND THE CAR BOLTED FORWARD. IT JUMPED A 6" CURB OVER PAVING STONES, WHICH WERE THROWN ABOUT AND SMASHED A WOODEN FENCE. A 4" STEEL COLUMN WHICH BACKS UP THE FENCE STOPPED THE CAR. LUCKILY NO ONE WAS INJURED....