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Check the wiring going to the O2's to make sure nothing is melted or shorted out. When it goes back to normal it is most likely going into limp mode. Also check for vacuum leaks which could cause it to keep adding fuel and making it too rich. And see if you can get someone with a scanner to watch it while it's running poorly to help identify what might be going on.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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