Now What?
I think it could be one or more of 3 things. I'll start from easiest to fix to hardest.
1. as mentioned, bent push rod. problem is, why did it bend?
2. collapsed lifter, it happens from time to time
3. wiped cam lobe, the way to check it is to pull the lifter out and check the surface that contacts the cam. If it's chewed up or dented in, in the middle, you have wiped a cam. I hope this is not the problem.
Jack