where would i put exacution wait time?

please tell me if either my wait is to low or if i need to add another! thx

local rightval = workspace.Part.value1.Value
local leftval = workspace.Part.Value2.Value
local father = script.Parent
local pos = father.Position
while true do
	if pos == Vector3.new(rightval) then do
		repeat pos = pos + Vector3.new(1,0,0) and wait(1) until pos == Vector3.new(leftval)
		wait (1)
		end
	if pos == Vector3.new(leftval) then do 
			repeat pos = pos - Vector3.new(1,0,0) and wait(1) until pos == Vector3.new(rightval)
			wait(1)
			end
		end
	end
end

I figured it out! In the future click the error and on the line, the error was on add a wait before that line i had to change:

	local rightval = workspace.Part.value1.Value
	local leftval = workspace.Part.Value2.Value
	local father = script.Parent
	local pos = father.Position
	while true do
	    if pos == Vector3.new(rightval) then do
	        repeat pos = pos + Vector3.new(1,0,0) and wait(1) until pos == Vector3.new(leftval)
	        wait (1)
	        end
	    if pos == Vector3.new(leftval) then do
	            repeat pos = pos - Vector3.new(1,0,0) and wait(1) until pos == Vector3.new(rightval)
	            wait(1)
	            end
	        end
	    end
	end

to:

local rightval = workspace.Part.value1.Value
local leftval = workspace.Part.Value2.Value
local father = script.Parent
local pos = father.Position
while true do
	wait(1)--the error was on this line because there was no wait--
	if pos == Vector3.new(rightval) then do
		repeat pos = pos + Vector3.new(1,0,0) and wait(1) until pos == Vector3.new(leftval)
		wait (1)
		end
	if pos == Vector3.new(leftval) then do 
			repeat pos = pos - Vector3.new(1,0,0) and wait(1) until pos == Vector3.new(rightval)
			end
		end
	end
end

so I moved the wait from the end to the beginning having the same effect with no errors the script doesn't work though