Engine surge on cruise or high idle

[Rockinbexpress]

Yeah it only does in on cruise control or if you idle it up with the cruise. You can hear it. You can watch the boost gauge go up and down 1 or 2 psi you can feel it and also see it in the rail pressure. Leak down test only loses 380 psi in 30 seconds. I'm thinking it's the turbo actuator. I noticed it's not opening all the way at 100% load