I never had a symptom, never had a CEL, no real loss in power, etc. mine was punched all the way through and had more of a slant on the plunger. We took all that we could out, put a new follower in with the shit pump, I bought the APR pump a couple of days later. Installed it and running like a champ now. Going on 7k miles. My follower punched all the way through, but not unevenly like the OP. Thats fuckin nasty how it wore off some of the side of the follower, but not all the DLC and top of it.