Code 43, ESC

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1993 Caprice with L05 engine
Getting code 43. Poor acceleration and mileage.
Replaced the knock sensor. And the knock sensor module twice. No change. CEL flashes constantly at speeds of 55.
What else could it be?
This L05 came from a "9C1" police vehicle. The difference is in cam and injector. Is there different cam confusing the computer? I am going to try the "9C1" computer and see if that changes anything.
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