How To Fix A Shaky Camera?

Hi, I'm using DeviousDeviation's sidescroller camera script and its shaking when the model moves. I was wondering if anyone had any problems like this while using a similar script or camera manipulation at all? The script:

while true do
game:GetService("RunService").RenderStepped:wait()
cam.CoordinateFrame = CFrame.new(plane.View.Position + Vector3.new(0, 2, 40), plane.View.Position)
end

The game: http://www.roblox.com/BRAND-SPANKING-NEW-place?id=191860631