This is for one ACSU engine PROM (also known as chip). This is for a ECM/ECU Service # 1227747 When replacing your PROM you must match the 4 letter code on your PROM from your vehicle. The 4 letter code will be on the EPROM/CHIP or you can get it off the sticker/label on the ECM/ECU. It usually is in the upper corner of the sticker/label.  Do not replace a PROM with a non matching unit.  Check the prom in your computer for the correct 4 letter code BEFORE you make a purchase.  This is for one EPROM/CHIP only and doesn't include the engine computer.

FITMENT IS FOR 1987, 1988 CHEVY/GMC 5.7L/350 W/AUTOMATIC TRANSMISSION W/1227747 ECM/ECM COMPUTER

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