There are a few active threads with the same problem. What's happening is that your K2 clutch is releasing. The clutch is likely toast, but it may simply be caused by a leak or plugged filter, as it takes a lot of fluid and pressure to engage the clutch. The first aid thing you want to do is check the level and top off if necessary. If that doesn't do it, change fluid and filter and add a viscosity improver additive. And when that doesn't work, start looking around for a used transmission or a rebuild.