Well now what?

Sounds like some of your lifters aren't pumped up with oil. Maybe bad lifters, or an oiling problem to them. I'd pull a couple of the ones that are "springy" and see what they look like. Maybe take it apart and preoil before putting it back in, assuming it looks good otherwise. With any luck, you can pull some of the ones that are easy to get to without having to pull the intake.