Those numbers seem good. I think that's only 8 or 9% variation.
A thread I just read on a chevy truck forum had a similar issue which turned out to be the pin in the harness to the ecm was bent and/or pushed back just enough to not make good contact. Once pin was corrected, truck ran great. Worth taking a look.
Last edited by V; 08-17-2020 at 06:39 PM.
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