Im trying to make a hoverboard but when I turn it kinda does a full circle?

Thank you for reading

local Part = game.Workspace.Part
local holdingUKey = false
local UIS = game:GetService("UserInputService")

UIS.InputBegan:Connect(function(inputObject) 

	if(inputObject.KeyCode==Enum.KeyCode.E)then

		holdingUKey = true
		while holdingUKey do
			Part.CFrame = CFrame.Angles(0,1,0)*Part.CFrame
			wait(0.001)
		end

	end
end)
UIS.InputEnded:Connect(function(inputObject)
	if(inputObject.KeyCode==Enum.KeyCode.E)then
		holdingUKey = false
	end
end)

You are attempting to rotate by one radian, not one degree. This is because CFrame.Angles() takes its arguments in radians.

Instead do this:

Part.CFrame = CFrame.Angles(0,math.rad(1),0) * Part.CFrame

Words of advice, your title should be more concise and your question shouldn't just be code without elaboration.