UPON SLOWLY PULLING INTO A PARKING SPOT MY FOOT WAS ON THE BRAKE BRINGING THE VEHICLE TO A STOP WHEN THE RPMs SUDDENLY WENT UP AND THE VEHICLE LUNGED FORWARD STRIKING THE STONE WALL IN FRONT OF ME. THE IMPACT CAUSED BOTH MY KNEES TO MAKE CONTACT WITH THE STEERING COLUMN. THERE WERE NO WARNING LIGHTS. THE AIRBAG DID NOT DEPLOY AND THE ONSTAR DID NOT ACTIVATE ALTHOUGH THE IMPACT WAS SUBSTANTIAL. I EXPLAINED THIS BOTH TO THE DEALER AND THE INSURANCE COMPANY. I WAS TOLD A GM ENGINEER WOULD NEED TO INVESTIGATE THIS ISSUE. I HAVE FOUND NUMEROUS ACCOUNTS OF THIS ONLINE.