- Look for evidence of fuel leaks around the gasket. Fuel leaks generally leave a purplish residue.
- With the engine running, listen for a hissing noise that indicates a vacuum leak.
- If you hear a hissing noise, you can confirm leakage by spraying starting fluid on the gasket mating surface with the engine running.
- If you hear a change in engine speed or sound, you have a leak.
- Replace the gasket.
Fuel Injection Gasket
Look for leaks between the throttle body assembly and the intake manifold. If the gasket is leaking, replace it.