Bedrck47
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Doubt the OSS is your problem since it is only an input sensor to the pcm. If you had a manual transmission with the clutch pedal depressed you would have the same symptoms you are having. Since it drives fine in reverse that tells you there is sufficient output from the pump since reverse requires the most pressure.
To venture a guess your problem may be with solenoids, bands or clutches. Did you drop the pan when you changed fluid? If so was there a bunch of dark gray goop in it?