Caution: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

Notice: Do not insert any tools into the throttle body bore in order to avoid damage to the throttle valve plate.

Notice: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
2. Remove the air cleaner outlet duct.
3. Inspect the throttle body bore and the throttle body plate for deposits. You will need to open the throttle plate in order to inspect all surfaces.
4. Clean the throttle body bore and the throttle plate using a clean shop towel with GM top engine cleaner, P/N 1052626 (Canadian P/N 993026) or AC Delco Carburetor Tune-up Conditioner P/N X66P or an equivalent product.
5. Install the air cleaner outlet duct.
6. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .