89-93 90 Century Grand Am Skylark Engine Computer ECM 1990 1991 1992 1993 # 6875 1991 Buick Century Engine Computer ECM Features: Part # 1228706 & should fit: ACHIEVA 92-93 Elec Cont Unit (ECU); 6-204 (3.3L)  CALAIS 89-91 Elec Cont Unit (ECU); 6-204 (3.3L)  CENTURY 89-93 Elec Cont Unit (ECU); 6-204 (3.3L)  CIERA 89-93 Elec Cont Unit (ECU); 6-204 (3.3L)  GRAND AM 92-93 Elec Cont Unit (ECU); 6-204 (3.3L)  SKYLARK 89-93 Elec Cont Unit (ECU); 6-204 (3.3L) MOST Computers 1999 & newer will need to be PROGRAMED TO YOUR CAR before they will work in you car. This will have to be done at a Dealer or mechanic with proper equipment. Please talk to your mechanic about this prior to purchase