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Classic signs that the ignition system is breaking down under heavy load at low RPM. Most likely bad spark plug wires but it could also be a problem with the coils or ignition control module. As soon as the transmission downshifts and/or the torque converter unlocks it takes some of the load off the engine and it smooths out.

Note: For clarification, this is on my '95 GMC not my reatta. @2seater you may recall this post from a while ago. I figured I would report back. These repair bearings failed, but not it the way I assumed they would. One side worked it's way out. There is not enough room for it to come out completely but it came out far enough that the flange of the hub ate up the seal and it started leaking like crazy. I suppose there is a reason GM designed the original bearings to press farther into the axel housing. I knew this was a bit of a gamble to try them but was curious. After testing them out though, I would not recommend them to anyone. Just buy new bearings and axels and do a proper repair. Picture of the bearing worked out: What it should look like: