2011 Chevrolet Equinox UNKNOWN OR OTHER

NOT SURE OF THE EXACT DATE OR MILEAGE VEHICLE MESSED UP FIRST TIME. WE BOUGHT IT ON JANUARY 19, 2011, MESSED UP WITHIN FIRST FEW DAYS OF HAVING IT. IT'S HAPPENED TWICE, WHEN VEHICLE IS STOPPED, BUT IN DRIVE (EX. RED LIGHT), THEN PRESSING THE GAS PEDAL IT WILL EITHER NOT GO AT ALL, OR BARELY GO AND THEN NOT GO ANY FURTHER. HAVE TO PUT THE CAR IN PARK, SHUT OFF, THEN TURN CAR BACK ON TO MAKE IT WORK RIGHT. TAKEN IT TO THE DEALERSHIP MULTIPLE TIMES, THEY SAY THEY CAN'T FIND ANYTHING WRONG OR DUPLICATE THE PROBLEM. NO CHECK ENGINE LIGHT COMES ON, OR ANY LIGHTS AT ALL. CONTACTED GM ALSO, THEY ARE NOT MUCH HELP EITHER, SAY WE HAVE TO DUPLICATE THE PROBLEM BEFORE TAKING ANY FURTHER STEPS. DON'T FEEL SAFE IN THE CAR, I HAVE TWO SMALL CHILDREN. THEY HAVE BEEN WITH ME BOTH TIMES IT HAS MESSED UP. THE FIRST TIME WE WERE STRANDED BETWEEN TWO LANES OF ON COMING TRAFFIC.