How to make a moving car|part script (Backwards and Forwards)

Car = script.Parent

while true do
wait(10) -- Time it takes before the Car leaves
for i = 1,100 do
Car:TranslateBy(Vector3.new(0,0,-1)) -- Goes straight
wait()
end
for i = 1,100 do
Car:TranslateBy(Vector3.new(0,0,1)) -- Goes back
wait()
end
end

Forwards)