I have a similar issue on my '98. Shudders like crazy on launch and 1-2 unless I really feather out the release. I haven't replaced the clutch yet, but all of my research agrees with what others have posted here. It could be the clutch disk, the pressure plate, the flywheel, or engine oil leaking on any of the above. You could get the real root cause by tearing it down and investigating all the clutch components, but by that time you're probably invested enough to replace them all.