That can be simple or a nightmare code. Have you made sure your tb is clean?
Check the wires again.
Every once in a while it ends up being the the 2 wires going to the tb is bad or broke inside that leads to the ecu or control box.
1 other thing. When you crimp those new pig tails GM has been very specific about using splice sleeves with the Kent Moore splicing tool, or problems with this code will return later on.
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