THIS CAR IS A 99 GRAND AM 2.4 THAT WAS SENT TO US FOR A TRANSMISSION REPLACEMENT. WE INSTALLED A UNIT WITH 44K MILES ON IT. TWO DAYS AFTER, CUSTOMER CAME BACK SAYING IT WAS DOING THE SAME THING. SO I DROVE CAR FOR THREE DAYS BACK AND FOURTH TO WORK WITH SCANNE... Login to read more.