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Stock GTO LS2 sensors

Forgot to mention the tune is for a LQ4 with spark curve from GTO


Initially I was seeing TC codes, sent back to correct and no no longer have them but Still have symptoms..

First off my transplant set-up: Stock 6.0 LS2 out of an 06 GTO with Auto trans out of same application in an 1986 Monte Carlo. PCM is out of an 05 6.0 silverado, service number is a12589463.

Why...