Why does my car start running so rough when it hits exactly 43 miles an hour

What is your question?

When my Cadillac gets 43 miles per hour it starts to run rough it loses power and its really sluggish I just had a new throttle positioning sensor put in and you EG R valve put in a new fuel pressure regulator put in a new fuel pump assembly and new fuel filter and a new catalytic converter why does my car start running rough when it hits 43 miles per hour