I've done a search and have plenty of info to go on for UIM removal, but my question is this...I expect that there is a gasket in there too? Would I need to replace that upon re-installation or is it fine to just leave the original in there. It's not held in place by any adhesive or anything is it? I'm putting in my new spark plugs and wires this weekend, so the UIM might come off so I have easier access to the plugs and I assume that it will need to be cleaned anyhow - I'll get both done at the same time.