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#1
08-10-2003, 08:51 PM
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computer
This is my first post, On a 1990 Grand Prix, can the computer be changed without having to change the prom? My car is slowly losing it's functions: idle control, a/c, now the transmission only has reverse.
Thanks in advance for any help. 
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#2
08-10-2003, 09:46 PM
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There is a prom inside the ECM that will have to be swapped over. just take the 4 screws off the access cover.
The transmission is probally going to be an internal transmission problem not an ECM problem
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