Runs fine till you shut off and try to restart then runs ruff?

If your vehicle runs fine until you shut it off and then it runs rough upon restarting, it could indicate several issues. Common culprits include a faulty fuel pump, a clogged fuel filter, or issues with the ignition system, such as worn spark plugs or ignition coils. Additionally, problems with the engine's sensors, like the mass airflow sensor or coolant temperature sensor, could also lead to rough idling after a restart. A diagnostic check can help pinpoint the exact cause.