It sounds like the computer is learning and making adjustments, but something is still not reading right (sensor) or the injectors still aren't firing. The reman ECU might be a clue that there has been a problem previously so maybe look for any electrical items that might have been replaced. I still suspect the wiring harness might be messed up at this point. And the corrosion means the seals were leaking at some time, they might have been replaced before you got the car.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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