You do the throttle body cleaning service, and you might be surprised at the results. When does this ever get done? I have experienced smoother idle, less stumbling, more power, and better fuel economy from just doing this easy and inexpensive service. Plan to replace this seal every 80K miles
Product Details
This gasket seals the intake air elbow, where it slides onto the aluminum lip of the throttle body. The seal is made out of a tough material, but it will not last forever due to heat. 272273
What a difference a clean throttle body plate can make in engine performance. I have seen engines stubble with poor acceleration and be miraculously cured by just cleaning the throttle body.
Here is the location of the seal.