Check the corrugated hose inside for a plastic ring. There should be a rubber o-ring and a plastic ring in place. The plastic ring sometimes falls out while you're removing the corrugated hose, and it won't seat correctly without it.Does anyone know if the corrugated hose that snaps onto the top of the intake manifold is supposed to be air tight? I recently replaced my intake manifold but the hose connector is wanting to slip a little up and down and it wants to suck air in. Can't figure out what I am missing. Thanks Cruze family.