'88 Buick Skyhawk, "K" vin stalling at stops

Car stalls when coming to a stop like the torque converter is still locked. Have replaced the MAP sensor and checked all vacuum lines. No stored engine codes.

What damage can be done if I unplug the blue TCC connector on the auto trans and test it like that for a while?

If this solves the problem, what steps do I need to take to repair the TCC sensor problem? Does the trans need to be taken apart and out of the car?

The TV cable appears fine and adjusted ok?

Thanks.

Dw