my Toyota Highlander XU70 (2020-Present) stalls when I stop what could be wrong

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery (negative terminal).

2. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, screwdriver.
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner onto a soft cloth and wipe the interior surfaces of the throttle body to remove carbon deposits.
• Reattach the air intake duct securely.

3. Replace the Air Filter

• Tools Required: Socket set or screwdrivers (if applicable).
• Remove the air filter housing cover.
• Take out the old air filter and inspect for dirt and blockages.
• Insert a new, clean air filter and secure the housing cover.

4. Test and Replace Spark Plugs (if necessary)

• Tools Required: Spark plug socket, torque wrench.
• Disconnect the ignition coil connectors and remove the coils.
• Use a spark plug socket to remove the spark plugs.
• Inspect the spark plugs for wear; replace if they show signs of damage or excessive wear.
• Install new spark plugs, tightening them to the manufacturer’s specifications (typically around 13-20 Nm).

5. Check and Clean IAC Valve

• Tools Required: Socket set, cleaning solvent.
• Locate the IAC valve on the throttle body.
• Remove the IAC valve and inspect it for carbon buildup.
• Clean the IAC valve using a suitable cleaning solvent and reinstall it.

6. Reconnect Battery and Test

• Reconnect the negative terminal of the battery.
• Start the engine and let it idle to check for smoothness.
• Test drive the vehicle to confirm the issue is resolved.