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Do you have one of these “Line Pressure Boosters”?
I had one fail and that resulted in the trans “hunting” for gears, slipping and erratic shifts. No trouble codes were thrown making diagnosis tricky.
Perhaps return the PCM to stock programming and see if the problem goes away.
I do not have one of those. I did return it to the stock tune. It did not go into limp mode either. I will check my wiring and 02sensors and the speed sensor after I go plug it in to service tool that works.
