Got this error [ Expected identifier when parsing expression, got 'for'] can anyone help me fix it?

local run = false

while wait() do

if run == true then 
	return
	
for i= 1, 300 do
	script.Parent.CFrame = script.Parent.CFrame * CFrame.new(0,0,2)
	wait()
	end

for i= 1, 300 do
	script.Parent.CFrame = script.Parent.CFrame * CFrame.new(0,0,-2)
	wait()
	wait(2)
	end

	script.Parent.CFrame = game.Workspace.SubPos1.CFrame
	run = true
	



		

This is a script for a car that goes down a track, i'm trying to make it to where when it reaches 'run = true' at the bottom that it repeats the action again.

Unfortunately, there is not much I can help you with as you didn’t show the full output. I recommend using the site https://developer.roblox.com/en-us/articles/Roblox-Coding-Basics-Loops