The computer chip (ROM) is located inside the ECU. This is located inside the truck behind the glove box on the right hand side. (89-91) Remove the bolts below the glove box that hold it in and pull that out. You will see the ECU as a silver colored box mounted up behind it there. Once you've removed the retaining bracket that holds the ECU in place you will see a small rectangular panel on the top of the ECU that is held on by two small screws/bolts, Your chip (ROM) is inside there. Be sure to remove the negative terminal from the battery before disconnecting the ECU or swapping out chips.
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Related Questions
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where is the over drive solenoid located on a 1989 Chevy Corsica
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