Symptom hub
Rough Idle After Refueling: Why EVAP Purge Problems Climb to the Top
A shaky idle that appears right after filling the tank is one of the clearest clues in the whole EVAP graph. Fresh vapor load from the canister can push a leaking purge valve, saturated canister, or bad tank-pressure feedback to the top of the list long before random coils or throttle cleaning deserve attention.
Likely related codes
Start your diagnostic path here
P0300 — Random/Multiple Cylinder Misfire Detected P0172 — System Too Rich (Bank 1) P0441 — Evaporative Emission Control System Incorrect Purge Flow P0496 — Evaporative Emission System High Purge Flow P0451 — Evaporative Emission Control System Pressure Sensor Range/Performance P0453 — Evaporative Emission Control System Pressure Sensor High Input