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feel like I've tried everything listed so let me ask specific issue - 2005 cobalt auto
speedo jumped all over so I changed output speed sensor
now no code but the car feels like in second and speedo does not move until about 20 MPH when car downshifts then shits up and runs fine
checked all fuses - grounded the TCM with a wire - cleaned all elec connections?

any suggestions?
thanks
 

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Did you re-seat the BCM connectors?
 

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Did you check the harness loom that runs by the thermostat housing for chafing?

---------- Post added at 01:22 PM ---------- Previous post was at 11:33 AM ----------

Also check the the ECM/TCM fuse #25 10 amp, actually I would replace it even if it looks good. Sometimes the tabs pit and corrode.

 
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