Cranking, then not cranking? I'd look at battery connections.
Starting stalling and erratic idle could all be water / ice in the fuel. Possibly weak fuel pump / pressure?
Higher shift points would not concern me, your ECM may be programmed to hold the gear longer. That allows the trans and engine to come up to temp. My GMC is a 2003 with the duramax / allison trans. It shifts that way when cold. It would not surprise me if yours was set up the same way.
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