For 1990-2009 cars only
- Remove the air cleaner outlet duct.
- Inspect the throttle body bore and throttle plate for deposits. You must open the throttle plate in order to inspect all of the surfaces.
- Clean the throttle body bore and the throttle plate using a clean shop towel and top engine cleaner, GM P/N 1052626 (Canadian P/N 993026), or equivalent.
- After disassembly, clean the throttle body using a parts cleaning brush. DO NOT immerse the throttle body in any cleaning solvent.
- Install the air cleaner outlet duct.
