I PULLED INTO A PARKING SPACE AT A DRUG STORE, STOPPED, AND AS I WAS PUTTING THE CAR IN PARK, IT SURGED FORWARD OVER THE CURB AND INTO THE BUILDING. THE ENGINE THEN RETURNED TO IDLE. I PUT THE CAR IN REVERSE TO BACK OUT AND IT SURGED BACKWARD BUT I WAS ABLE TO STOP IT QUICKLY. IT AGAIN RETURNED TO NORMAL IDLE. THE CAR HAS 57K MILES AND HAD NO PRIOR PROBLEMS WITH THE ENGINE.