AT LOW RPMS THE TRUCK WILL LUNGE FORWARD /REVERSE DEPENDING WHICH GEAR YOU ARE IN . THIS HAPPENS WHEN IT WANTS IT IS NOT A CONSTANT . IT IDLES HIGH AND SURGES. FIRST OCCURRENCE HAPPENED IN FEB DEALER DID NOTHING . NEXT OCCURRENCE IT ALMOST HIT MY DAUGHTERS FRIEND WHEN SHE PASSED IN FRONT OF ME. AGAIN DEALER DID NOTHING AND FINALLY THE LAST OCCURRENCE IT LUNGED INTO A TREE. AGAIN DEALER AND GM FOUND NOTHING. I HAVE DOCUMENTATION FROM THE MITCHELL REPAIR COMPANY THAT STATES THAT THE YEAR MAKE OF MY TRUCK THIS HAS HAPPENED . HOWEVER GM DENIES THIS. THIS TRUCK IS NOT SAFE. *TR