2009 DODGE NITRO 4X4 Engine And Engine Cooling Problems

1. WHILE DRIVING ON INTERSTATE AT ABOUT 65 TO 70MPH MY TRUCK MADE THIS THUMPING SOUND AND A BIG JERK. I STOPPED AT THE TRAFFIC LIGHT, THE TRUCK ACTED AS IF IT WAS GOING TO SHUT OFF. I DROVE OFF AND THE TRUCK BEGAN TO JERK REALLY BAD. WHAT COULD THIS BE????? *TR 2. THE LOCK ON THE PASSENGER DOOR WOULD NOT LOCK WHEN YOU PRESSED THE LOCK SWITCH ON THE DOOR AND ON THE KEY, YOU HAD TO PUSH THE KNOB DOWN BY HAND. I HAD TO SPEND MONEY TO GET THIS FIXED. 3. THE PLASTIC THAT'S ON THE SIDE OF THE SEATS HAVE BROKEN WHEN GETTING OUT OF THE VEHICLE. LOVE THE BODY OF THIS VEHICLE BUT TOO MANY THINGS WENT WRONG TOO SOON. *TR