So, I made the script for the part to move up down constantly with while true do function. But it won't work I don't know what is wrong...
Here's the script(its long):
local part = script.Parent.Parent.VIPTEXT
while true do
part.Position = "-668.4, 12.1, -102.3"
wait(0.5)
part.Position = "-668.4, 12.2, -102.3"
wait(0.5)
part.Position = "-668.4, 12.3, -102.3"
wait(0.5)
part.Position = "-668.4, 12.4, -102.3"
wait(0.5)
part.Position = "-668.4, 12.5, -102.3"
wait(0.5)
part.Position = "-668.4, 12.6, -102.3"
wait(0.5)
part.Position = "-668.4, 12.7, -102.3"
wait(0.5)
part.Position = "-668.4, 12.8, -102.3"
wait(0.5)
part.Position = "-668.4, 12.9, -102.3"
wait(0.5)
part.Position = "-668.4, 13, -102.3"
wait(0.5)
part.Position = "-668.4, 13.1, -102.3"
wait(0.5)
part.Position = "-668.4, 13.2, -102.3"
wait(0.5)
part.Position = "-668.4, 13.3, -102.3"
wait(0.5)
part.Position = "-668.4, 13.4, -102.3"
wait(0.5)
part.Position = "-668.4, 13.5, -102.3"
wait(0.5)
part.Position = "-668.4, 13.6, -102.3"
wait(0.5)
part.Position = "-668.4, 13.7, -102.3"
wait(0.5)
part.Position = "-668.4, 13.8, -102.3"
wait(0.5)
part.Position = "-668.4, 13.9, -102.3"
wait(0.5)
part.Position = "-668.4, 14, -102.3"
wait(0.5)
part.Position = "-668.4, 14.1, -102.3"
wait(0.5)
part.Position = "-668.4, 14.2, -102.3"
wait(0.5)
part.Position = "-668.4, 14.3, -102.3"
wait(0.5)
part.Position = "-668.4, 14.4, -102.3"
wait(0.5)
part.Position = "-668.4, 14.5, -102.3"
wait(0.5)
part.Position = "-668.4, 14.6, -102.3"
wait(0.5)
part.Position = "-668.4, 14.7, -102.3"
wait(0.5)
part.Position = "-668.4, 14.8, -102.3"
wait(0.5)
part.Position = "-668.4, 14.9, -102.3"
wait(0.5)
part.Position = "-668.4, 15, -102.3"
wait(0.5)
part.Position = "-668.4, 14.9, -102.3"
wait(0.5)
part.Position = "-668.4, 14.8, -102.3"
wait(0.5)
part.Position = "-668.4, 14.7, -102.3"
wait(0.5)
part.Position = "-668.4, 14.6, -102.3"
wait(0.5)
part.Position = "-668.4, 14.5, -102.3"
wait(0.5)
part.Position = "-668.4, 14.4, -102.3"
wait(0.5)
part.Position = "-668.4, 14.3, -102.3"
wait(0.5)
part.Position = "-668.4, 14.2, -102.3"
wait(0.5)
part.Position = "-668.4, 14.1, -102.3"
wait(0.5)
part.Position = "-668.4, 13, -102.3"
wait(0.5)
part.Position = "-668.4, 13.9, -102.3"
wait(0.5)
part.Position = "-668.4, 13.8, -102.3"
wait(0.5)
part.Position = "-668.4, 13.7, -102.3"
wait(0.5)
part.Position = "-668.4, 13.6, -102.3"
wait(0.5)
part.Position = "-668.4, 13.5, -102.3"
wait(0.5)
part.Position = "-668.4, 13.4, -102.3"
wait(0.5)
part.Position = "-668.4, 13.3, -102.3"
wait(0.5)
part.Position = "-668.4, 13.2, -102.3"
wait(0.5)
part.Position = "-668.4, 13.1, -102.3"
wait(0.5)
part.Position = "-668.4, 12, -102.3"
wait(0.5)
part.Position = "-668.4, 12.1, -102.3"
wait(0.5)
end

6 comments
Is this a server or local script?
It's a normal script, but do I need to put it into a local script, I'm trying it into the ROBLOX Studio mode..
Positions are Vector3 values, how you have it you're setting them to String values. It would be like this; part.Position = Vector3.new(-668.4, 13.4, -102.3) Also, might I suggest looking into loops; http://wiki.roblox.com/index.php?title=Loops
Owwhhh.... You are be going to kidding me, now I have to paste all of them...
Like I said, look into loops. Then you might only have to make one adjustment.
Using a for loop would be much better as said above. It's ROBLOX doing the work for you. Also I'm not sure if you're aware but using CFrame instead of Vector3 might also interest you. http://wiki.roblox.com/index.php?title=CFrame