I have already done a trans service on my car and it helped, but only for a few days. The computer seems to be the culprit. Everything I do helps for only a day or two, and then it shifts harshly again. Cold morning shifting is very slow and sloppy too.
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'98.5 Mystique GS ATX/re-contented door lights/K&N Filter/Energy Suspension Sway Bar Bushings/Mintex Street Pads/high-beam bulbs in low-beams/Pioneer DEH-P3100 receiver/Pioneer TS-A6855's in all doors