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Are the PROM chips for the GM 4.3 throttle body fuel injection and the 5.7 engine the same?

We replaced a 4.3 ltr. engine with a 5.7 ltr. engine in a '89 S-10 pick-up. It runs good, but I wonder if the the computer is reading the correct RPM as it is a 4.3 computer.


The ecm and prom are probably different, but if they're both tbi engines(I know the 89 4.3 was), and your check eng light is not coming on, just run it for a while.

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