For 1990-2009 cars

### Removal Procedure

1. Remove the air intake ducts.
2. Inspect the throttle body bore and the throttle valve plate for any deposits. It is necessary to open the throttle valve in order to inspect all of the surfaces.

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

3. Clean the throttle body bore and the throttle valve plate by using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 or AC-Delco Carburetor Tune-Up Conditioner, P/N X66-P, or an equivalent product.

### Installation Procedure

1. Install the air intake ducts.
2. Tighten the clamps. Ensure that there are no air leaks.