NHTSA Complaint #721781 — 1998 CHEVROLET CAVALIER

HIGH PITCH HUM USUALLY AFTER 45 MPH BUT OCCURS ALSO WHEN MOTOR IS STRESSED RELATED NOT SHIFTING . MOTOR SHIFTS AT 10MPH, 20MPH, AND SOUNDS STRESSED / LABORED FROM 45 TO 55MPH BEFORE IT SHIFTS AGAIN IF IT SHIFTS AGAIN. CAR IS AUTOMATIC 3 SPEED. WHEN SHIFTING IT JERKS FORWARD AND THEN SUDDENLY PULLS BACKWARD HARD. WHEN SITTING STILL SHIFTING FROM PARK TO DRIVE CAR JERKS HARD. WHENSITTING STILL AND SHIFTING FROM REAR TO DRIVE, CAR SHIFTS HARD. ALL GEARS SHIFT HARD. USING TRANSMISSION OIL. OFTEN HAVE TO RESTART ENGINE 4 TIMES BEFORE IT REMAINS RUNNING. COUNT TO 10 BEFORE RESTARTING DOES NOT HELP. WHEN DRIVING DOWN THE ROAD, OFTEN FEELS A HARD PULLING LIKE IT IS REALLY WORKING HARD TO PULL ITSELF. ACCELERATES AND DECELERATES AS IF IT HAS ITS OWN MIND. CHEVY TRIED TO REPROGRAM TWICE BUT WOULD NOT TAKE SO REPLACED COMPUTER ABOUT 8 MONTHS AGO. BUT IT IS DOING IT AGAIN. *AK