With my experience with them, you almost always need to replace the gasket material, donâ??t ever use the same material twice. Wonâ??t idle as good, I learned that the hard way. Took it off, put the [censored] one back on, and then it still didnâ??t work, found out on here you should replace the gasket material, its very cheap, just go to an auto store and ask for it. 4-5 bucks after tax.